I have a 2011 Ford 250 which I haven't driven all winter but have charged the battery from time to time. Yesterday when I hooked up the charge the light started blinking and I hear a clicking around the fuse box??
Battery most likely went bye bye and the charger was feeding just enough power to try to activate the anti thieft system, a 2011 has factory presets that get wiped out when the battery power is lost, thats why when you go away you put on a battery tender unit, this keeps the battery charged and has an extremely low rate so it won't burn the battery up. now they make a preset saver that holds those settings while the battery is getting replaced. the only thing I can suggest right now is replace the battery and see if it will fire up, if it does then find out how many systems are no longer operational, if everything checks good then you got lucky, if not then you headed off to the dealer to have the computer system reflashed, then hope nothing else got fried due to low voltage.
I disconnected the cables and charged the battery up, hooked back up and all seems fine. Will have the battery checked out and leave my trickle charger on, Thanks for your help,
Sounds like you got lucky there. You might want to have the charging system checked at the same time just to be on the safe side.
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