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I'm looking at one in front of me. It's a 12 gauge wire. 4 gauge is the size of the main cable (that runs down to the starter). If you've got a 135 amp alternator (not likely unless you spent a LOT of money), then you'll of course want to use a larger cable. As for my fuse comment, the factory wiring had a fusible link I believe (anyone???). The purpose of this "breakable" curcuit is in case there's a short... so you'd want it to be able to handle whatever current load you were expecting to pull off the alternator. But a short's basically a gazillion amp draw, which needs to be checked with some kind of fuse apparatus.
Kenneth
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