Thread: Alternator / Voltage Regulator
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Old 09-12-2015, 02:10 PM
Large Arbor Large Arbor is offline
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Join Date: Oct 2013
Location: Columbus, OH
Cobra Make, Engine: ERA 714
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Hey Patrick and others,

New battery, new VR, and New Alternator and the battery is not staying charged. It was tested last week and had 800 plus cranking amps. I ran the car for 20 minutes and the battery is now reading about 9 volts with a charger on it. I took a voltage reading from the alternator when running and it read 18 V.

The only thing known drawing current is the fan. How do I diagnose this problem? Could I still have a bad VR?

Phil
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