Thread: Voltage drop when the fan is on
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Old 07-18-2020, 05:58 AM
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Moritz55 Moritz55 is offline
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Join Date: Jan 2020
Location: Raleigh, NC
Cobra Make, Engine: Superformance, '65 427/MKIII with Roush V8 - 351W w/770cfm 4BBL Holley, 514hp
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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.
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Superformance: SPO2454 , Titanium w/Black Stripes
Engine: Roush 427SR w/770cfm 4-Barrel Holley
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Last edited by Moritz55; 07-18-2020 at 10:38 AM..
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