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Do a load test on battery if original may not be able to hold a charge

Check for a hidden accessory left on (glove box light etc.)

Disconnect the - battery cable and install a test light between cable and battery - if it illuminates there is current flow remove each fuse one at a time until light goes out to determine which circuit is drawing current. Could be a bad voltage regulator not opening circuit on shut down Could be excessive parasytic load - check with amp meter should not exceed .07 amps

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Q: Battery running down overnight on 98 Toyota Sienna?
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