Quote:
Originally Posted by Phx Mike
Still get a slowly declining voltage the longer I drive. So - either not enough alternator output to keep up (voltage goes from 13 down to 11.5 when I have the fan on and then down from there at about 0.5 volts every 10 mins) or a grounding problem somewhere.
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Electric fans are notorious current-hogs, and if you drop 1.5 volts just by turning the fan on, then I think you found your culprit.
13 volts at the battery with the engine running and the fan off is still pretty anemic- Your alternator should hold rock steady at 13.5-14.5 volts with the engine idling and ALL your electric accessories running...