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Battery drains over night. battery is good..problem is intermittant. driving me crazy!

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Hello jfrolio.

It's often an interior light such as a glove box or a trunk light. If the switch is "on edge" and bumped one way or another it may or may not come on all the time creating an intermittent problem.
Perhaps pulling the bulbs out of those for a couple days will help determine this.

Or a more direct route will be to disconnect one of your battery cables and install a 12 volt test lamp in between the cable and the battery. (even better would be a clamp on ammeter).
If the test lamp is bright there will be a drain.
Start pulling fuses one at a time until the test lamp dims considerably or goes out. That will be the circuit that is pulling down the system.You will then need to repair the circuit that is draining.
Keep in mind also that a bad diode in the alternator will also cause this but usually isn't intermittent.The fuse for the alternator may be screwed down in the panel. Sometimes just as easy to pull the main wire off the alternator to check this...CAREFULLY as the main wire cannot touch ground or you will burn the fuse.

If you require further assistance with this issue ask me in a comment here.
Thank you for using Fixya.
KL

Posted on Mar 17, 2011

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