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either the battery is bad or there is an electrical draw in the car. a simple test to check for a short or draw, with a hot battery in the car remove either battery cable but only one place a test light one end on the battery and the other on the removed cable if the test light glows for a second or 2 this is normal , if it glows steady there is a draw in the car , remove the fuses one at a time until the test light goes out , once the light goes out this is the circuit where the problem is located . if the light never goes out then it is most likely bad diodes in the alternator. happy hunting.

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Q: Why does your Battery go dead in your 1988 Cadillac?
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