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power draw from heater fan


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I just noticed that my heater fan is pulling my battery power down below 12v (between 10-11). Nothing else electrical pulls the power down - I can have the wipers, lights, stereo all going and it still be at 12v, but as soon as I turn on the heater fan, it drops instantly. Should the heater fan pull that much juice? My last Soob's (DL's) have not had the battery guage, so I don't know what's ''normal'' and what's not on all these guages yet.....

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