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I have been told you need to watch the wire harness where the wires cross through the body to the door. The harness becomes damaged and may cause a short circuit. For whatever reason it may be grounding when doors are locked.

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โˆ™ 2006-02-04 23:25:05
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Q: Why does locking the doors on a 1991 Buick Regal run the battery down?
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