Indentify this...7M-GTE related

[radeonboy]

Hello folks,

I need your help. Okay my Dad has a 1991 Toyota Supra Turbo with a 7M-GTE engine.

His old battery was bad so he got my uncle to get another battery. My uncle is like a self mechanic....So he got this battery (not new) that is a Group 41, 675CCA battery.

Just checking the original ratings, I find out that it is a 600CCA battery (this is from Interstate batteries site - is this wrong?) so the battery that is in there isnt too far off, just a tad stronger.

Basically what happened after he drove it for a while and a couple of days after, he found out that the alternator postive post wire going into this other terminal burnt. This it probably shorted/sparked/went bad.

Now he wants to know how he can fix this problem? He is thinking if you could tell him the name of the object that is circled, he could find one in the junk yard and replace that single object.

Now I am curious, how does this happen when the battery is 75CCA more stronger than stock?

I figure the positive ground wire is sooo damn small and thin (I was surprised) that it couldnt possibly hold that much amps, let alone the stock 600CCA. This wire is like 20 gauge or something, look at it in the pics.

THANKS folks. Need everyones help!

[TcmaBoy]

First off, the battery capacity has nothing to do with this. The CCAs are a measure of the storage capacity. The starter and electrical systems still draw the same number of amps. The higher CCA rating means that you can crank the engine for a longer period of time, not that more power is being sent to the parts.

The battery also has no impact on that harness. The only time there is a load on that harness is when the engine is running and the alt is providing power. It looks to me like you need a new alt. When replacing it you need to inspect and repair that harness.