Question about 1999 Toyota Avalon

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Battery died, replaced altenator, got new battery, battery still dieing

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Since you replaced both the alternator and the battery, it should be working and the first thing to check is for loose and corroded connections.
In any case, this is what you should do to check the health of your car charging system with the assistance of a good (no need for an expensive unit) digital multimiter:
1) With the car engine not running and ignition off, measure the voltage across the battery: it should read around 12.8 Volts and anything below 10.5 Volts would indicate a faulty battery with possibly one or more shorted cell.
2) With engine running and idling, measure the voltage around the battery terminal: it should read around 13.8 Volts and any thing below 13.5 Volts or much above 13.8 will indicate a faulty alternator OR alterntor regulator.
3) Repeat step two by gently reving the engine: the correct 13.8 Volts should be maintained even with car light on.

Hope it helps: let me know how you go!

Posted on Apr 25, 2010

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