Quote:
Originally Posted by psychoSEAL
Battery engine off 12.5
At 1200 - 1500 rpm 14.3
Engine warmed up with fan on 13.9
Ran another ground wire to a different location on block. Light did not come on until running for about 1 mile. Light came on and then off after a few seconds. Drove approx 3 miles with no alternator light on. Checked voltage at altternator when running. Same reading 13.9 with fan on. ???????????
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13.9V at what RPM? Which fan? (or better yet, how many Amps does it draw?) 13.9V at above 1500 RPM with the fan on is marginal, so I would suspect a bad diode in the alternator. Less likely: bad battery.