My battery wire keeps melting!, 94 ST, PLEASE read! thanks!- Options

[mgnt232]

So im not sure where this wire goes, but its the smallest one on the (pos.) battery. When I replaced my engine the wire got cut too short and now I have to make a small extension on the wire (only about 5") But and I am pretty sure this is why it keeps melting but I need some opinions,
I keep using a 12 gauge (have used auto, and home electric wire both melted). But I am thinking the wire that is stock is a 10 gauge, that part never melts only the small extension will melt the casing, or any amount ot electrical tape right off of it. It is in the engine bay so it may get hot i guess but I even put some split loom on it and it melts on the inside.
Is this because I am using too small of a wire?
Thanks to anyone who can help me confirm my problem!-

This post has been edited by mgnt232: Mar 9, 2010 - 6:30 PM

[Espo]

It's best to keep the gauge consistent. If the stock battery line is 10 gauge, use a 10 gauge - my alternator went and toasted my ground wire, almost started a fire in my engine bay a few weeks ago - $600 repair, had to pull my entire engine harness out and whatnot.

In any case, don't use smaller gauge wire for sure - your battery is putting out massive voltage/amps and will toast anything of improper size.

Your connection is only as good as it's weakest link.

Also, ensure your positive battery terminal is tight.