1999 Honda CRV battery discharging over night.

jeff hb · Posted at Wed Nov 04, 2009 3:59 pm

Electrical problem
1999 Honda CRV 4 cyl All Wheel Drive Automatic 70,000 miles

The repair shop cannot find why battery is draining over night. Battery has been replaced.Also new one has been checked. alternator is charging. all door light switches have been checked using the draw down method referenced on this site. Repair man baffled and gave up.Please suggest something.

rasmataz · Posted at Wed Nov 04, 2009 4:08 pm

Finding an electrical short can be a nightmare-Do below

jeff hb · Posted at Thu Nov 05, 2009 6:42 am

Test was completed at repair shop no electrical draw and battery still going dead over night.

KHLow2008 · Posted at Thu Nov 05, 2009 7:32 am

If there are no parasitic electrical drain, the battery would not go dead, unless it is bad. What I suspect is an intermittent problem and this are usually caused by fan motor realays which intermttently sticks resulting in the fans staying on after the ignition switch is turned off.
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jeff hb · Posted at Thu Nov 05, 2009 9:03 am

Thanks for the info. I will recheck the battery & look into the relays or other intermittent stuff staying on.

KHLow2008 · Posted at Thu Nov 05, 2009 10:55 am

Does the draining occur every nite or only intermittently?

jeff hb · Posted at Thu Nov 05, 2009 11:37 am

The battery goes dead every night.
Thanks

KHLow2008 · Posted at Fri Nov 06, 2009 11:02 am

That should be easy to detect.

Get an ammeter and disconnect the negative battery terminal. Attach the ammeter between the terminal and battery negative post and you would be a ble to read if there are any parasitic drain.

To test if it is the battery that is bad, leave the terminal disconnected and check if you are able to start in the morning.