Fusible Link Between Alternator And Battery

this fusible link failure may mislead you to a costly replacement of an alternator as oppose to a 10. So I did that. If a short were the case one would think a fuse would pop first before knocking out an alternator. No continuity. Re: is it the alternator, belt, battery, or fuse? Go to a auto parts store and buy a volt/amp load meter ($20. I think I got confused when I read that China was one of the largest producers of lithium as a raw. The Redarc Smart Start VSR battery isolator and how it works. Assuming your wire is 2-gauge or larger, I'd use a 200-amp fuse. All my wiring under the hood will have tech flex insultherm which is good up till 1200 degrees. A few months back my FJ would be dead after a couple of days and had to be jumped off. Check the voltage on the thick brown(s) at the alternator plug (remove the cap but leave the plug plugged in). Only the large battery cable to the starter and a large wire (10 GA) from the alternator to the starter. No charge after new Alternator installation. The cable has also discoloured due to the heat and resistance, and Ive measured a volt drop of 0. ill trace it and see what i come up with. You should be able to deflect them an inch or so without a lot of pull. Are there fusible links between the alternator and battery that could have become separated??. Got it all back together and still the alternator isn't charging. Like a major internal meltdown of the stator or rectifier inside. It's covered in the 1st post of THIS THREAD. INSTALLATION INSTRUCTIONS Alternators corroded. I want to upgrade the big 3 or 4. • No power, like if the battery was dead. If the wire looks like it only has two ring terminals, it doesn't have a link. Start as stated with the negative post of the battery. Before about 1980, there were no fusible links on alternators, but after that it is common practice to have a fusible link between the alternator and battery to prevent fires and wire burning up in the unlikely event that someone installs a battery with the polarity reversed or if a diode in the alternator fails. 1 day ago · The easiest method in my view is to get a second battery (true deep cycle) for the fridge, and just wire a split-charge relay. Genuine Dodge Part # 68164797AA (68250245AA) - Terminal. A fusible link between the battery and generator is hot the the touch. Look at the harness and try to find where it has shorted to ground. Another type of cable may use two smaller wires that connect to your starter and your alternator output for charging. Today fuse links protect all the major circuits at the source (as close to the battery as possible) to limit fires and major wire harness damage. This was more like a reddish orange fuse not a burgundy. I concur about the alternator. If there is no power getting to your fuse panel, there is a break in connection from it to the battery which is the fusible link. Not a good find on a boat demanding the utmost in fast charging…. disconnect BK-Y at the Alternator if Ok then check alternator. For some reason, possible ease of replacement, thy used plug in connectors at both ends. 5v while the aux. Yellow Bullet Forums > Technical Section > Electrical: Alternator wire gauge. the harness wire has been resoldered to fix it but I cant find where the fusible link goes. These links must transmit high-current electricity, but also protect the rest of the electrical system from dangerous spikes that could cause a fire. Some blown fusible links are very obvious, they look like they were thrown in a fire. Got it all back together and still the alternator isn't charging. I would replace the connection as soon as possible. Ships from Mopar Parts. No 12 volts and the dark green fuse link between the orange/black wires and the battery side of the starter solenoid has open circuited. The standard alternator current runs through it to charge the battery, as does all the battery current to run everything on the vehicle (factory wiring). Understanding The Ammeter Setup In Your 240-Z. an entire new cable is required. it's just a possibility. Plows put a heavy load on the electrical system. Check the OEM service manual for the location of each fusible link and proper circuit diagnostic procedures. The charger is fitted between the alternator and battery(s) and, unlike conventional regulators, requires no modification or interference with the alternator whatsoever. ill trace it and see what i come up with. If battery voltage is indicated in Step. The fusible link is designed to protect the wires in the car. Using my trusty ammeter, I find the drain in the fusible link box on top of the battery. Fusible links function differently than many fuses. 2 at the battery, and at the post on the back of the alternator, so the connection is good between the battery and alternator. Order Toyota Tundra Fusible Link online today. The problem comes from a corroded fusible link that is in the cable between the alternator and starter. There is no way a 10 gauge wire can handle 140a for a extended period of time. Remember, fuses protect the wire, not the device. When I jump start the car it slowly loses it charge and even after fully charging the battery at the place I bought it and still wont hold a charge. Fusible links can sometimes be difficult to recognize, so be sure to check. When you set up for camp, you need lights, power for your water pump, maybe a fan, radio, or TV etc. the usually blow once they get corroded enough over time Check these guys out. I need to know precisely where to find the fusible link between the alternator and the battery, since both lines to the alternator connections run in one wrapped bundle. Ensure battery voltage is also present between White/Green wire terminal and ground. grab yourself a multimeter and do some pinpoint tests. No more continuity between alternator cable and battery cable. I have a 6ga wire running from my alternator output to the starter's common battery post with no fuse or circuit breaker. There is a fusible link from the starter motor to the fuse box under the dash. Check the OEM service manual for the location of each fusible link and proper circuit diagnostic procedures. Then he made mention of a fusible link?? We spoke of a buss type box near the AC unit on the firewall. Didn't fix the problem. Online shopping for Fusible Links - Electrical from a great selection at Automotive Store. – If a fusible link is open, then electrical current will be completely lost to all electrical circuits controlled by that fusible link. 1) Too much load - The amount of load (components using power) may be too much for the amount of output the alternator is capable of producing at that slower speed. The wire that goes from the box to the alternator is 8ga fusible link wire that attaches to the bolt. Miller Subaru Boise, Boise ID. The fusible link is located between the battery and EVERYTHING (except the starter). Before about 1980, there were no fusible links on alternators, but after that it is common practice to have a fusible link between the alternator and battery to prevent fires and wire burning up in the unlikely event that someone installs a battery with the polarity reversed or if a diode in the alternator fails. How To Test Ford F-350 Alternator Check the fuse link between the starter relay and alternator. ill take a ohm meter and see if iget continuity through the whole wire. Check to make sure the wire is not broken. GM has started to place fusible links between the alternator and battery. A fusible link between the battery and generator is hot the the touch. Should be somewhere between the fusible link and the yellow wire to the ignition switch or from the fusible link to the BK-Y wire to the alternator. The fusible links are located very close to the battery, in the individual power circuits for running the car. Good Answer: You are on the right track. I have a 2012 CRV and with daytime only driving, it routinely charges the battery to only 12. There's nothing between the battery and the alternator. Watched the test happen at the store - 14. This is actually to protect the alternator and car electronics from the battery though (as the battery can output many more amps that the alternator). Remove, clean, and tighten the connection where the battery power comes in. Fuse tested and is functional 9. 3G alternator: Look for 12 volts at the stud on the back of the alternator where the 4 gauge power feed wire is bolted. If your battery's voltage is falling and continues to fall, there may be a break or fuse blown that's preventing the alternator from charging your battery. Check the fuses on a ohm meter (sometimes a fuse looks good when it isn't). Disconnect the two alternator leads where they come out of the primary case and plug them into the two white leads. The alternator and battery both connect (positive side) at this point. These links must transmit high-current electricity, but also protect the rest of the electrical system from dangerous spikes that could cause a fire. you have confirmed that the alternator is not charging the battery for sure. wire, 14 Ga. I patterned it after the stock setup on my old chevy truck which has the same alternator. Running a cable directly from the battery to the alternator used to be the common way to hook them up. See what DC volts is and check for A/C voltage at the battery (meaning alternator isn't converting voltage properly). Fuse properly to protect the thick wire. The other end of the fusible link I soldered to the 4-gauge wire and covered the solder joint with heatshrink tubing. It may not have a fuse, but it may have a fusible link. Suspect that fusible link may be the problem as to why not only the alternator light is on, but I had weird glitches in instrument panel (loss of tachometer and speedometer. When too much current flows. The light bulb doesn't come on under the hood even when a good battery is hooked up. Can you tell me where the fusible link is from the battery to the fuse box in a Volvo 740 4 cylinder is? The fusible link is between the alternator and the battery, connected with heavy wire. A properly designed OEM basic circuit layout looks like this: The common connection point is where alternator, battery, and loads all join. To All Balmar Partners and Customers: January 4, 2016. Ensure battery voltage is also present between White/Green wire terminal and ground. Notice: Undefined index: HTTP_REFERER in /home/forge/newleafbiofuel. Wire #15 Red 10 Ga. Suspect that fusible link may be the problem as to why not only the alternator light is on, but I had weird glitches in instrument panel (loss of tachometer and speedometer. I drove about 3000 miles on vacation, got home and car wouldn't start. If battery voltage is indicated in Step. Better to blow a fuse than to blow up. A few months back my FJ would be dead after a couple of days and had to be jumped off. The fusible link is simply a wire that is 2 gauges larger than the wire it is connected to (smaller in size though). huh! a ground issue? I again make my way down the chain toward the fuse panel, then the other way toward the battery. Thebattery live terminal should be protected with a fusible link locatedunder the hood. troubleshooting and voltage drop tests below to pin point the problem before replacing the alternator. Such a fuse is called a fusible link, and comprises lengths of copper wire of varying thicknesses between two two-pin plugs. If the battery and alternator connections are tight and clean, you almost certainly have an alternator on the way out. A battery isolator only transfers power from the alternator to a secondary battery. No more continuity between alternator cable and battery cable. if it doesn't then you may need a new alternator. Alternators are meant to maintain battery charge and not to charge a totally dead battery as it would draw a very high current that may damage the alternator and, yes, melt the fuse. Didn't fix the problem. Your next step is to go to TEST 3 and check the 120 Amp Main Fuse that's located on the battery's positive terminal assembly. Fusible links are always smaller in size than the wire of the circuit in which they are installed. First, the battery delivers a jolt of electricity to the starter. A fuse like above would be a great idea. The connector with the red rubber cover is the one that goes towards the alternator. You stated 11. PUt a battery charger on it just to see something, and the guage shows she gets 18 volts w/ charger attached. Also DO NOT wire the car without some sort of fuse or fusible link between the starter solenoid and the wire to the fuse panel and ignition switch. •If the alternator is not performing, it is important to resolve any additional forklift side problem(s) in the charging circuit that may have effected the alternator. The 'link' is necessary to protect the wiring should the alternator short. Disconnected the battery and the cable from alternator. There is no way a 10 gauge wire can handle 140a for a extended period of time. 8 v is measured across the battery with 3pin removed its not a smart charge fault. See what DC volts is and check for A/C voltage at the battery (meaning alternator isn't converting voltage properly). ADD A CIRCUIT FUSE TAPS; ALTERNATOR CHARGING SYSTEMS. While waiting for the next alternator from NAPA, I went through some more T/S and am now looking for a Fusible Link between the Alternator Generator Field Connector (2-Pins +/-) and the PCM. I also have a heavy circuit breaker between the starter and battery mounted in the trunk near the battery. 5 V between those two places. Looking at the wiring diagram, I see there is a fusible link in between the starter and the ignition key switch. For some reason, possible ease of replacement, thy used plug in connectors at both ends. They stated the alternator was bad, which I believe it was something else. It's equipped with a four cylinder engine with PTO. If the low cell does not come up, it's bad and you need a new battery. Resistance should be less than 0. I put a thru-hole terminal on one end of the fusible link. link on the charge wire of the. There's nothing between the battery and the alternator. this system worked flawlessly for over a year, then one day the gage fuse blew and the main battery died (not while plowing). I've sold my tent trailer and I'm awaiting the Snoozy. Please be patient with us as we build the library, and hopefully the answer to your question is already on this page. BATTERY ELECTRICAL Click the button below to add the Ford Starter Solenoid Fusible Link Orange 16 Gauge. However, I’m hoping on rainy winter days the B2B charger will help support the system. Hello wondering if anyone knows if there is a Fuse-able link between the starter and alternator. 5v… but when i turn it on, it goes to zero volts. The other end of the fusible link I soldered to the 4-gauge wire and covered the solder joint with heatshrink tubing. Schematics seem to - Answered by a verified Pontiac Mechanic We use cookies to give you the best possible experience on our website. In additon, GM has a 40 amp Mega fuse protecting the loads from the Auxiliary battery. OrangeTractorTalks - Everything Kubota > Kubota Talk > Service, Repair & Maintenance: L3830 Fusible Link Location. yes , please send the sequence, I just trackeed down a battery, Seems that everyone in my area that has the same group size battery needed one cause it was hard to find. The fusible link (8mm) is the key here. Orange wire fed by the GEN / BATT fuse in the underhood fuse box. Also to be considered is that the power that the alternator provides goes thru more than one cable - in the case of the Commodore, the white cable supplies power directly to the operational side of the car (thru a fusible link) whilst the thick red one supplies power to the battery (to replace power that has been drained previously and with no. Electrical connection between Battery, Alternator and Starter run the line back to the fuse box, where all my case 4 gauge wires between battery, solenoid and. The alternator is not outputting between 13-14. A mechanical fusible link is a device consisting of two strips of metal soldered together with a fusible alloy that is designed to melt at a specific temperature, thus allowing the two pieces to separate. When it comes to RV or trailer camping, the usage on your battery differs substantially from that of your vehicle primary starting battery. Luckily cars in 1983 had few electronics. 8V, your alternator is failing. Remove the 4 x 10mm screws and change the fusible links. Note: Crimp the gray fusible link on the end of this wire where it attaches to the large post on the starter. The iMA battery light will come on because some of the components that run the hybrid system are 12-volt, so they need to run from the service battery. 2003-2006 Mitsubishi Evolution VIII-IX without ACD. A dead battery after a few days has been a problem on several makes of car, not just my 2012 Hyundai Sonata. However, I’m hoping on rainy winter days the B2B charger will help support the system. battery with alternating current, so it must be rectified to direct current. The truck originally has a 63-amp alternator, I'm swapping in a 105-amp later model one, and I'd like to wire everything up as correctly as possible, the factory wiring runs through 10 gauge wiring on the charging system with a few fusible links, am I able to leave this in place and simply run a larger gauge (and fused) wire to the battery, or. also if you have a rear mount battery need one inline with the alternator or generator. When you find them grab each link and give it a bit of a pull. I replaced the battery with a new one that night. Electrical. The fusible links are located very close to the battery, in the individual power circuits for running the car. The most important component you'll install in a car audio system. To go back a bit I've had some frustrating electrical problems the last several months, and they are continuing on the ol 337. Replace the mega fuse (or in-line fusible link) and check to see what may have caused the mega fuse to have blown (after all, a fuse doesn't burn for no reason). A fusible link will be along the cable(s) running between the positive terminal of the battery and the battery terminal of the alternator. Replace if burned out. I would replace the connection as soon as possible. 5na with 200 amp alternator. So look at the back of your alternator for the large (6 ga) wire and follow it. Locate your fuse boxes, and become current with fuse sizes as well as color codes. So for one, definately do not use a fuse with any higher than a 300A rating. Electrical connection between Battery, Alternator and Starter run the line back to the fuse box, where all my case 4 gauge wires between battery, solenoid and. Yellow Bullet Forums > Technical Section > Electrical: Alternator charging issues. Any fusible link should only be between the power source (solenoid battery terminal) and the wire going to the under-dash harness to prevent electrical fires in the car. if it doesn't then you may need a new alternator. To All Balmar Partners and Customers: January 4, 2016. Defective alternator. The alternator output is varied to maintain the battery at the acceptance voltage. It seems weird the pros would put a fuse in line between the alternator and the battery. Anyway, new alternator works fine which means the regulator was bad (just like you mentioned) in the old new alternator. 4 Volts w/ truck running. Removed and had the Alternator tested (lifetime warranty from OReilly). I Can't seem to fine the fusible link or inline fuse in my car! I did an engine and tranny swap, new battery and alternator and when I was done, started the car, it was fine, drove it, it worked fine, I got back home, turned it off, Nd it wouldn't start after!! Fuses in fees box are good, electrical is all hooked up right!. After raising the hood and taking the side covers off, I see the fan belt is loose as a goose. New alternator not charging. at off, the battery should be between 12. Any other fuse of any type in the main charging system is simply a "belt and suspenders" approach to electrical circuits. This all started when the battery just went dead about a week ago(I think we now know it didn't just go dead, but the alternator just quit charging). I need to know precisely where to find the fusible link between the alternator and the battery, since both lines to the alternator connections run in one wrapped bundle. Fusible links are perfect for what they do in a smaller current situation. You can see where a fat cable from the alternator enters/connects to the fuse box and right next to it the battery cable connects. However, I’m hoping on rainy winter days the B2B charger will help support the system. Can you tell me where the fusible link is from the battery to the fuse box in a Volvo 740 4 cylinder is? The fusible link is between the alternator and the battery, connected with heavy wire. Why did fusible link blow on battery and alternator wire glow hot? 1 Answer. That's the point I was talking about in your other thread where you were talking about fuse and wire size upgrades. The alternator warning light and field circuitry is protected by a 20 gauge red wire fusible link used in the battery feed to voltage regular #3 terminal. Is the alternator's drive belt tension within specification? Too Loose. The primary symtoms are low voltage readings, weak starts, and premature battery and alternator failure on post 06 sprinters. Actually, everything I read said it should be 4 wire gauges smaller than the wire you're trying to protect. Ok, cleaned and checked all the wires. The alternator system is responsible for keeping your battery charged during operation by changing the current from AC to DC. Anyway, new alternator works fine which means the regulator was bad (just like you mentioned) in the old new alternator. I would suggest that you have a certified technician, like one from YourMechanic, test the battery and complete an inspection of the electrical system in order to pinpoint the problem and make the necessary repairs. Toyota recommends that the alternator fuses be tested for both voltage and resistance. Click the button below to add the GM Starter Solenoid Fusible Link 14 Gauge to your wish list. As soon as the alt stops charging, and the voltage drops below around 12 volts, the ABS will set a voltage code and turn on the light, as there won't be enough voltage to run the pump motor. For some reason, possible ease of replacement, thy used plug in connectors at both ends. But in the Skylane/Skyhawk every time I switch off the battery the alternator switches off too :-(. Can you tell me where the fusible link is from the battery to the fuse box in a Volvo 740 4 cylinder is? The fusible link is between the alternator and the battery, connected with heavy wire. Save on Fusible Links with great deals at Advance Auto Parts. Thanks for all the info and pictures. Look at the harness and try to find where it has shorted to ground. Switch off, only chassis battery is charged. So if the alternator were good, and the fusible link bad, when pulling the negative terminal while running the vehicle would still die because the juice from the alternator is unable to complete its circuit back to the battery due to a break in the fusible link. Some blown fusible links are very obvious, they look like they were thrown in a fire. Miller Subaru Boise, Boise ID. But in the Skylane/Skyhawk every time I switch off the battery the alternator switches off too :-(. Just keep going. Fusible links can sometimes be difficult to recognize, so be sure to check the entire length of cable for soft. I would replace the connection as soon as possible. Where is the fusible link located that is in between the alternator main wire and the battery. A fusible link will be along the cable(s) running between the positive terminal of the battery and the battery terminal of the alternator. Defective battery. That leaves the question of a Mega fuse (275amp) for the battery + cable. Fig 4 - Checking Ripple Voltage Ripple voltage or (AC voltage) can be measured by switching your DMM to AC and connecting the black lead to a good ground and the red lead to the "BAT" terminal on the back of the alternator, (not at the battery). I have the battery in the trunk so I have one fuse between the alternator and the battery in case the alternator shorts out. - If a fusible link is open, then electrical current will be completely lost to all electrical circuits controlled by that fusible link. I'd use whatever the Cadillac used. From what I can make out, a smart alternator, when the main battery is charged, will reduce the current output to a point that wont allow the D250s to turn on. They should both have power with the engine running or the key in the ON position. It's the heavy black wire, closest to the centerline of the car, and does show a 3. When a heavy current flows, such as when a booster battery is connected incorrectly or when a short to ground occurs in the wiring harness, the fuse link burns out and protects the alternator or wiring. Are there fusible links between the alternator and battery that could have become separated??. The alternators contained in each row will have the exact same mounting. I actually did check 'all' the fuses in the Engine Fuse box, additionally, someone had suggested a fuse wire. Set the meter on 10 volts AC (remember its AC current coming out of the alternator). Online shopping for Fusible Links - Electrical from a great selection at Automotive Store. The light bulb doesn't come on under the hood even when a good battery is hooked up. Also, note that connecting the remote voltage sensing terminal to the battery will only result in the alternator being a good battery charger - it still won't compensate for voltage drop in the system caused by wiring to the main distribution point and increasing electrical demand as more components are powered on. He says that this is the fusible link and may be bad and not allowing the energy to return to the battery? Battery last about a day or so, then it's drained. Check your FL 0. How long do I make the fusible links? One other thing, the feed from the alternator is protected on the battery side, but wouldn't it be a good idea to put one by the alternator in case the wire becomes shortened in between. I understand that fusible link sizing is based on the wire it is on, but when looking for NOS parts you get part numbers and alternator amperage rather than a fusible link gauge number. When it reaches 1,000 degrees, it will separate and kill the circuit. fusible link. They tend to be hidden in with the wiring harness bundles. The page describes how to diagnose and repair fusible links. this is usually because an alternator under stock conditions wont ever need more than 75% of it's. Start as stated with the negative post of the battery. Have shore power in the morning and plan on it that. I have a 6ga wire running from my alternator output to the starter's common battery post with no fuse or circuit breaker. wire, 12 Ga. Typically you get BATTERY/ALTERNATOR VISIT WORKSHOP warning when the electrical system voltage in the car is below 12. Electrical connection between Battery, Alternator and Starter run the line back to the fuse box, where all my case 4 gauge wires between battery, solenoid and. 4 Volts w/ truck running. I replaced the 120A alternator fuse and re-measured that same voltage drop at the same location and it only measured 0. They are 40/50 + amp links – These flat links develop cracks and lead to problems with power steering and ABS etc. Pulled the alternator harness off and tested resistance on all wires - 0. The proper way to charge an additional battery pack off an alternator would be to use a Battery Isolator, such as our Quick Power 120 Amp Battery Isolator Bi303303. These links must transmit high-current electricity, but also protect the rest of the electrical system from dangerous spikes that could cause a fire. ill take a ohm meter and see if iget continuity through the whole wire. How I fixed it. Two, actually. In certain modern cars, a special type of high-resistance fuse is fitted into the main battery feed - usually where it passes out of the starter solenoid. Interchangeable Alternators. I have an old 1950's Cub Lo-Boy Tractor. Good Answer: You are on the right track. To continue with this potential problem, as far back as 1960 when Chrysler first used an alternator, there has been a fusible link in the output wire between the alternator and the battery's positive post. It would allow the full voltage output of the alternator which over charged the battery causing it to out gas all of the battery acid. 4 volts at the batteries while engine running. Dead! So, I am wondering if i have a fusible link problem. 8V) on a starter battery as well as provide enough power to keep all of the van’s equipment running, such as lights and a stereo. Examples of circuits where the Fusible Link wire will be the most reliable short-circuit protection are; *the main power wire to the dash area, *the alternator-to-battery "charging wire," *power-up wire to electric radiator fans, and other systems where the amount of current flow is a large amount for long periods of time. Ok, cleaned and checked all the wires. It seems weird the pros would put a fuse in line between the alternator and the battery. alternator fuses be tested for both voltage and resistance according to service data, the tundras charging system is supplied by four fuses: the alt h fuse, alt s fuse, met fuse and lh ig fuse according to toyotas wiring schematic, the alt h fuse connects the alternator stator with the battery. Not a burgundy. Fuse tested and is functional 9. How I fixed it. ALTERNATOR TEST 2: Checking The Continuity Of The Alternator Fusible Link. I am writing this to help determine the size of a fuse to use in the alternator's main battery output cable, i. A healthy alternator should be putting out 9 volts. Calculating the Fuse Size. If the low cell does not come up, it's bad and you need a new battery. He says that this is the fusible link and may be bad and not allowing the energy to return to the battery? Battery last about a day or so, then it's drained. Based on that you must have an accurate voltmeter. According to service data, the Tundra’s charging system is supplied by four fuses: the Alt-H fuse, Alt-S fuse, MET-fuse and LH-IG fuse. But a charging circuit blown fuse, a broken fusible link, a failed diode in the alternator's rectifier assembly, even a worn out bearing will affect charging system operation. So look at the back of your alternator for the large (6 ga) wire and follow it. If there is no power getting to your fuse panel, there is a break in connection from it to the battery which is the fusible link. It’s most common use is in alternator wires. Here’s a boat wiring diagram that shows that setup. A battery isolator only transfers power from the alternator to a secondary battery. I drove about 3000 miles on vacation, got home and car wouldn't start. Have shore power in the morning and plan on it that. No 12 volts and the dark green fuse link between the orange/black wires and the battery side of the starter solenoid has open circuited. Any significant resistance on this wire could be detrimental to the operation of the alternator. The O'Reilly guy said it could be possible that the belt isn't spinning the alternator pulley fast enough. Schematics seem to - Answered by a verified Pontiac Mechanic We use cookies to give you the best possible experience on our website. Suspect that fusible link may be the problem as to why not only the alternator light is on, but I had weird glitches in instrument panel (loss of tachometer and speedometer. A fusible link is incorporated into the wiring harness between the starter relay and alternator to prevent damage should the harness become grounded or a booster battery be used. TEST 3: Checking The Alternator Circuit Fuses. I have a 6ga wire running from my alternator output to the starter's common battery post with no fuse or circuit breaker. The black fusible link wire in the EA-ED is 1. I got this fuse at a local auto parts. Based on that you must have an accurate voltmeter. Turned igition on, did not start car, but wire to alternator became glowing red hot. I did some more research and found out lithium cells are actually produced in several countries. You may have to solder the. There's a fusible link between the battery and the ammeter but none between the alternator and the bulkhead disconnect. I am only getting 12. It has special very high temp insulation that won't burn even if the wire becomes so hot that it fuses open. Fusible links—also spelled fuseable and fusable—serve a similar purpose to a fuse. Yep, I have done some reading and there should be a current limiting device (fusible link) somewhere between the alternator and the battery. Alternator regulator automatically adjusts alternator field current to maintain alternator output voltage within prescribed limits to correctly charge battery. The alternator's path to charge the battery is from the alternator, to this tie point, then to the battery. Toyota Charging Systems Typical charging system components include: IGNITION SWITCH When the ignition switch is in the ON position, battery current energizes the alternator. Of course, someone may ask: "Why do you need two separate (the "S" and the "A") connections between the battery and alternator?". Charging System - General Information. This is a simple way to grab power and functions fine at a relatively low cost. 297,000 and still the factory alternator. Goes flat after a couple of weeks of none use. If you are using an ammeter in the dash DO NOT use an alternator larger than 63 amps and MAKE SURE that you install a 4 inch (minimum) length of 16 gauge fusible link between the alternator and the ammeter so that the gauge does not become the fuse in the circuit. ) The Acceptance Cycle guarantees thorough charging by continuing to charge the battery until the charging current becomes a small percentage of battery capacity (2% default). Got it all back together and still the alternator isn't charging. Since the fusible link is four wire gage sizes smaller than the circuit wire leading up to it, it will become much hotter in a dead short than the "lead-in" wire.