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What causes lights heater fans to dim or slow down with the motor running?
Wiki User
∙ 16y ago
Weak battery not holding a full charge or alternator not supplying a suffient charge to the battery - check with a voltmeter A fully charged battery should read approx. 12.8 without engine running Approx. 13.8-14.2 with engine running
Wiki User
∙ 16y ago
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