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It depends what you consider to be a "slow drain" the parasidic load on this vehicle will discharge a FULLY charged battery in 21 days. How new is the battery and what state or charge is it in? Have you checked the Alternator? Like most batterys in cars, trucks, ect, they tend to get dirty. A slow battery drain is more than likely caused by a short between your +/- posts. To check this, attach one lead of a low volt meter the + post of the battery, and then draw the other lead across the top of the battery. If the meter shows any voltage at all, that's the problem. Wash the battery with a mixture of backing powder & water, and rinse. Dry the area between the posts & check with the meter again. I've often seen (online) that there is a problem with the load-leveling system which causes this....Here's a page which discusses this:

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Q: What causes a slow battery drain in an 1988 Olds Toronado?
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