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Often it's an alternator diode. Check the battery first. When batteries start to go bad they can often start to discharge over a couple hours. Take it to an auto parts retailer and have them test the battery and alternator for you. I had the same problem with my '92 Windom (ES 300). It was a faulty trunk mounted CD changer that was draining the battery.

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โˆ™ 2006-11-11 21:19:33
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Q: What would cause the battery to drain overnight on a 1991 Lexus ES250 if the car was off?
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