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Locate the power drain. You either have a switch on the doors or trunk that isn't cutting off...a light stays on. OR you have a badly installed car stereo/amp/or alarm system. Have you checked your alternator output? You can do so for free at Auto Zone. They can check it "on car". If you can, and it's an aftermarket stereo system, (after checking alternator and battery) disconnect stereo from power and wait overnight to see if better. This could also happen if you have a low-wattage alternator and a HUGE sound system that sucks down power. Auntetr

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15y ago
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Q: How do you stop a 1980 Toyota supra from losing its battery power?
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