Thread: 427 SO Timing/cooling fans
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Old 07-24-2008, 02:09 AM
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I think you need to measure voltage drop at idle (700-800) when the fans turn on. --

and again at 1000,1500,2000 RPM. There should be a initial V drop then the alt should kick in to prevent discharge of the battery.

The alternator sizing or index speed sounds like it is off and is not able to prevent discharge at idle.

--Steve
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