Posted by chevt73 on November 24, 2009 at 20:52:55 from (68.190.249.207):
Chevy 350 engine question 3 wire alternator? I have a 100 Amp Powermaster alternator. My car is setup with dual fans from a Ford Focus. One fan is on all the time, the other is set to come on when the A/C is on (I am going to change that to a temperature controled setup). Both fans run thru seperate relays. Today I noticed that when the second fan comes on the Ammeter goes to a 15 amp discharge. Without it on the gauge is normal. No change when the headlights are on. Checked the voltage at the battery. One fan on it was 13.6, when the second fan came on the voltage dropped to 12.5. Which says to me no charge. I also noticed the alternator was whinning with a beraing like noise. Verified it to be the alternator by taking the belt off, no noise with the belt off. Also with the car in vent mode and blower motor running no effect on the Ammeter. What do you guys think?
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