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Rear windowiper and defogger will not work, fuses are ok, have had trouble with battery would this cause these items to not work

Have checked fuses, there ok.Battery went dead 2weeks ago,and almost again this past weekend.

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Terry, you have something in the circuit related to wiper and defroster electric grid that causes your battery to drain power slowly. . Use an amp meter to check the fuse or relay or switch that is the cause of problem. Remove negative Batt cable from terminal, attach one of the amp probes to the cable end and take the other amp probe and attach to Negative battery terminal. I use a radiator hose clamp to tighten probe onto post. Turn meter on. It will show a certain amount of amp drain on meter. I suspect if Batt takes over a week to drain, your drain would be about .5 or less...Now start removing each fuse and relay until the meter shows ZERO. For pulling relay and fuses you can buy a relay puller or long needle nose type plier with a right angle bend at the very end at auto parts store. $10. When meter goes to zero....look in your booklet you received with truck at fuse box section. If Relay...Replace relay with new one, could have been pushing enough electricity across as if you had switched it on but not enough to cause wiper to activate etc. ALLDATA AT library has schematics diagram to look at all possible switches etc that could be the cause. At least you have it narrowed down to circuit. I have further way to jury rig to bypass problem, but your truck is to new to go down that road. Take to dealer with your info, may be on warranty.

Posted on Dec 10, 2014


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