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The defroster is drawing more electrical current than the alternator can produce. It could be that the belt is slipping and the battery is margianally low so that when you turn on the defroster the alternator can't keep up and the battery isn't able to provide enough current to keep the ignition operating.

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โˆ™ 2006-03-31 05:43:44
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Q: What caused a squeal and the car to stall when you turned on the defroster?
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