Re: can't find source of battery drain
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Originally Posted by HUMTECH
To test for excessive draw you need to disconnect the Negative battery cable and put an amp meter inline between the neg cable and neg bat terminal. Should have no more than about 40mA draw. If it is higher then start pulling fuses. Common areas for draw are hvac, radio, onstar and especially any aftermarket devices.
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We used to do it that way 40 years ago but used a simple test light. The old ways still work!
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