i have a problem with my alternator

2002 CHEVROLET VENTURE
180,000 MILES
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JWJTRAIN
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Auto-zone did a test on my battery and told me my alternator wasn't working. So it drains my battery. I took it off and took it in to get it tested through their machine and it was good. I checked all the wiring so i don't know why my alternator wont work. Someone suggested it could be the computer... any ideas?
May 10, 2012 at 10:50 PM
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ASEMASTER6371
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first, forget about the computer.

the big fat wire behind the alternator should hsve 12 volts all the time

the little connector has a 12 volt hot wire and one from the ignition switch.

Roy
May 10, 2012 at 11:33 PM