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Here is my thoughts. The battery is obviously losing charge when its running. Thus it can only be the voltage regulator or alternator as other than the fan, nothing else is running. The fan draws less than 20 amps and the alternator puts out 80 amps. If the Voltage regulator is working properly then the alternator would charge the battery. I will take readings, but when I came home the battery was reading around 10.75 V. I charged it and it is now reading 12.5 V. With everything else off, except the fan, and the battery not draining when its sitting, I conclude the alternator is not sending the necessary current to the battery to charge it. The external voltage regulator controls that thus my conclusions above.
Phil
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