Alternator, voltage output question. - Team Camaro Tech
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post #1 of 3 (permalink) Old Aug 1st, 10, 11:26 AM Thread Starter
Join Date: Jul 2005
Location: Winston-Salem, NC
Posts: 12
Alternator, voltage output question.

Ok, so I installed a March under drive serpentine setup. My voltage used to run 14+ volts(while driving) with the under drive pulleys it was around 11 volts(while driving). I swapped out the alternator pulley for one that was the same size(actually a little smaller) as my old one and I wired my alternator to be a 3 wire, yet I still only run about 12.5 volts(while driving). My water pump pulley is the same size as the old one and the crank pulley is only 1/4" smaller, so it shouldn't be under driving the alternator any more. Last night I had it out after dark and my gauge was showing about 11.5 with the headlights on.

When the car is running I have 12.4 at the battery and the alternator. Pretty much every where else is getting 11.9-12.1. I drove the car about 175 miles with it under driven and only putting out 11.4 at the alternator. Do you think I damaged it. It is a Powermaster, I don't know what amp. I looked a part number on it, but can't find one.

I wired the 3 wires up with the one blade looped back into the charge stud and the other is being fed from a switched source from the fuse panel and has a 3amp diode. I have a 4ga wire from the charge stud to the starter lug, cause my battery is in the trunk. It hasn't left me stranded yet and starts fine. I just figure it will preform better with more voltage.

Can anybody find a flaw in anything or is the alternator going/gone bad? I can get the alternator check at pretty much any parts store, right? When tested it should put out, what? 14+ volts. Thanks all.
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post #2 of 3 (permalink) Old Aug 1st, 10, 01:24 PM
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Location: Fairfield, CA
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Re: Alternator, voltage output question.

Where does your gauge measure the voltage? Take the looped sense wire off the charge stud and run it out to your main power distribution point, like the horn relay.

"For those that will fight for it...FREEDOM ...has a flavor the protected shall never know."
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post #3 of 3 (permalink) Old Aug 1st, 10, 02:26 PM Thread Starter
Join Date: Jul 2005
Location: Winston-Salem, NC
Posts: 12
Re: Alternator, voltage output question.

The gauge is wired into the fuse panel. But all the other measurements I took with a multi-meter.
I was thinking about doing that with the sense wire. I took my alternator off to take it to Advance to have it tested and stuff was rattling inside it. I shook it up and little pieces started falling out. Some mystery pieces fell out and a piece of wire and a white plastic cylinder thingy. Guess it's off to Summit shopping I go.
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