battery dies out when parked - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

lucanhookup · 06-28-2005, 09:29

ok my dad is having problem with his 1986 ford f-250 pickup. if he leaves his car parked for more then like 9 hours the battery dies. what can be the problem? the machanic told him the alternator was fine so what else can it be?....thanks

USAdiesel · 07-08-2005, 11:00

How old is the battery, it might have a bed cell. Also, there could be a short somewhere which slowly sucks the life out of the battery within a few hours.

Brandon_7 · 07-08-2005, 20:30

He has what is known as a parisitic draw or an unwanted drain on the battery. Somthing like a bad switch could cause this. If it drains the battery in 9 hours it is most likley somthing that is drawing alot of current. The battery should have the power to last for longer than that. Im not sure exactly what could be causing the drain, but more than likley it is somthing that requires alot of current since it drains it so fast. The only thing that I can think of is to check anything that he might of installed such as a CB or anyother after market electrical accesories.