Thread: Voltage drop when the fan is on
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Old 07-18-2020, 02:38 PM
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Cobra Make, Engine: BDR build #983, FRM 392
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Quote:
Originally Posted by Moritz55 View Post
I agree .. Fans drop voltage and amperage quite a bit. I did find that my Alternator needed a GND cable added so that it performed better. I have a Powermaster 105amp (17294) alternator.. It's a 1 wire alternator which required 8gauge wire ground. The original install did not have a GND cable!

This made a huge difference under load... mine went from 14.2V at 900rpm down to 13.4V at my battery with Lights ON and Fans ON ... but still charging the battery!

May be wise to confirm you have a solid GND to chassis or block as insurance... just a thought.
Only two wires attached to my alternator - thick red one on the backside and a thinner red one with yellow stripe on a connector attached to the side. Doesn't appear to be any ground wire. How and where do I attach a ground wire?
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