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Fusible Link between alternator and statrter or from battery to starter.. what guage is it suppose to be..

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On a GM the fusible links are always 2 sizes smaller that the wire they are in. I believe the wire you are talking about is a #10 red wire so it would need a #12 fusible link. Hope this helps.

Posted on Apr 10, 2011

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Is there a fusable link that would keep the alternator from charging battery in a 1991 chevy corsica


Yes, I believe that would be a fusible link, rather than a large fuse (maxi-fuse) used on later models. The fusible links will tie into the positive battery cable somewhere. If not at the battery, then look for them where the positive cable connects to the starter. A bad fusible link will look like some of the insulation melted, may have bumps and bulges where the fusible link blew out. To replace a link, you cut it out and solder in a new link of the same rating.

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If there is no voltage of the Large Red wire that is bolted to the back of the alternator, then you have a wiring problem. This wire usually goes directly to the starter where it joins up with the wire from the battery. There is, in most cases, a fusible link installed in-line on this wire (not a fuse, a fusible link). If this line draws too much current, then the link melts ans acts as a fuse. Once it melts, there will be no charging voltage as the alternator output cannot get to the starter, or the battery.

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What guage wire for the black fusible link?


There should be 2 white wires coming from the alternator. There is a splice where it will go into 1 wire then into the fusible link. If the fusible link is not burned, simply match the gauge wire coming from it. You should never use anything smaller in diameter than 10 gauge wire for the charging system. If you want to replace the fusible link, you can run separate white wires from the alternator to the positive battery post with individual fuses or fusible links. I would recommend each wire have its own Maxi fuse holder with a fuse no less than 60 amps each.

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My dad's '95 Buick Lesabre Custom does not want to keep the battery charging, I've cleaned all the terminals, checked all the grounds and still no luck. I've replaced the alternator and...


It most likely is a fusible link on the starter,connect a large wire(better to be larger than the one that is on there already)to the back of the alternator and go to the positive side of the battery,or to the starter hot post,where the battery positive cable connects to the starter,this will take care of the problem,no fusible link will be needed.The fusible link really hinders the charging capacity to the battery and running of the engine,cause it carries less amps in the smaller fusible link wire,this will solve the problem most likely.

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Most starter circuits will have a fusible link in them. That is basically a wire that goes from a heavy guage, to a smaller guage in the middle, back to the heavier guage wire. The point of it is that if the circuit gets too hot, the smaller guage wire will burn, acting like a fuse. Check the wiring. A burnt fusible link will be visible by bubbled/melted insulation on wiring.

Ensure that the starter bolts are also tight, as that is how they ground out.

If the wiring is all OK, then i suppose you could suspect a faulty ignition switch.

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From starter solenoid to alternator. This is in case the alternator starts pushing too many volts, it's meant to slow burn. You may have fried the voltage regulator and subsequently the fusible link.

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These cars have a fusible link in the large guaged wire off the back of the alternator these are known for burning out. When these go the alternator can charge but it does not go back to the battery. Check for this at the back of the alternator and at the starter.

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