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The most common reason batteries drain on cars is a bad diode in the alternator. The alternator will still test out good as far as power output goes. Try this: disconnect the positive cable(largest) on back of the alternator and then touch it back to the post you removed it from;( remember it is hot so don't touch it to a ground) if it sparks as you touch it to the same post then it is probably the alternator causing the drain.

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โˆ™ 2011-10-18 21:11:27
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Q: Is there a contoller for the dome lights and cruise control that can cause the battery to drain?
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