Ther should only be 2 wires at the alternator, on eis the battery charge line (the big one by itself), the other is the exciter line to turn on the regulator, most guys (including GM) wire that back to the ignition switch. I just run it right back to that that battery lug with a short 2-3 inch jumper lead. If you have B+ at the exciter trigger and only battery voltage at the charge lug than the alternator is junk.
PS, disconnecting the battery while the car is running is a bad idea and a really bad idea if you are running a PCM.
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Dennis
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