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!