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Re: Battery won't hold a charge
Posted by Dean [Email] (more from Dean) on Mon, 21 Feb 2005 06:03:00
In Reply to: Battery won't hold a charge, Ron, Mon, 21 Feb 2005 05:22:59
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If you charged the battery with a charger and it went dead again with the vehicle parked, then that does seem to rule out the alternator as a variable in this problem.
With the battery drained to some extent, measure the battery voltage, then run the engine, with headlamps off, and measure the voltage then. If the voltage goes up, the alternator is working to some extent. Fully charged, the voltage may be 14.5VDC or so. You can have battery and alternator tested for free at Autozone.
When you remove the ingition key, does the cylinder pop up? There are also procedures for measuring the vehicle drain on the battery in milli amps (mA).
A plug in battery charger is a good thing to own, even if you only need it every 5 or 10 years.
If you have the radio code, and fully charge the battery then disconnect it... if the battery looses its charge again, then I think that you would have to consider that the battery is self draining (a rare problem).
Can you check that the trunk light goes off?
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