The Ford Barn - View Single Post - Dead 6V battery, 12V jump start with pos and neg wrong

Mikeinnj · 03-21-2015, 11:48 AM

All original Model A electrical systems are all positive ground.

To check the polarity, remove the front carpet or rubber mat on the drivers side and there should be a removable metal cutout plate on the floorboard where you would rest your feet. Pull the cover up and look and see if the previous owner had installed the assumed 6 volt battery as a positive ground. ( + side to the chassis )

To remove and replace the Battery : Remove the screws attaching the floorboards and remove the floorboard to gain access to the battery. Before installing the new battery, clean the cables, both ends, especially where the positive grounds to the chassis.

If your car has a fuse block installed on the top of the starter, check the fuse. If blown, replace with a 25 amp fuse. Good luck and enjoy the new truck.

03-21-2015, 11:48 AM	#3
Mikeinnj Senior Member Join Date: May 2010 Location: Northern New Jersey Posts: 1,262	Re: Dead 6V battery, 12V jump start with pos and neg wrong All original Model A electrical systems are all positive ground. To check the polarity, remove the front carpet or rubber mat on the drivers side and there should be a removable metal cutout plate on the floorboard where you would rest your feet. Pull the cover up and look and see if the previous owner had installed the assumed 6 volt battery as a positive ground. ( + side to the chassis ) To remove and replace the Battery : Remove the screws attaching the floorboards and remove the floorboard to gain access to the battery. Before installing the new battery, clean the cables, both ends, especially where the positive grounds to the chassis. If your car has a fuse block installed on the top of the starter, check the fuse. If blown, replace with a 25 amp fuse. Good luck and enjoy the new truck.