Quote:
Originally Posted by allcarfan
Its not just the heater. If I turn on my heater...I get about a 1.2v drop. Turn on my electric fan...another 1v drop. Headlights, wipers, sound system, another 1.5v drop. (headlights are LED, so I am guessing there shouldn't be much of a draw.)
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Then it is either 1) Your alternator; 2) Your voltage regulator; or 3) The wiring connections between your battery, the grounds, and the alternator itself.