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Old 04-01-2009, 03:57 AM
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2006 Batteries draining sometimes


I have a 2006 F250 King Ranch. From time to time the batteries go dead for no reason (months in between). I boost it and it starts then it is fine for a few months.

I had it to the dealer several times but they could not find anything while it was under warranty. My warranty ended and it happened again and Ford would not do anything about it even though it is a reacuuring problem that they did not fix in 3 previous service visits.

Could somebody please give me some ideas on what to check? The only modification the truck has had was the dealer installed day time running lights, could this cause a problem? Could the heated seats stay on? I make sure everything is switched off before I shut the truck off.

Thank you for any help!

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Old 04-15-2009, 05:44 AM
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Hi, Mine did the same thing. Batteries were dead in the morning after the truck was parked all night. I felt around the engine bay and found the glow plug relay to be extremely hot. I tried to explain this to the ford tech and he kept repeating that the GPR was supposed to be hot when trying to start the engine. Only after explaining that the truck had sat all night and useing language normally attributed to small children, he started to comprehend. If you can drain 2 750 amp batteries overnight, you have a pretty good leak. The GPR was replaced and no issues since.
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