Working on grandpa's car.

[koates]

You can put 12 volts just on the starter without putting 12 volts on any of the other electrics. Just connect a 12 volt battery using jumper cables to the starter motor main terminal and ground on the engine block making the block connection last. The 12 volts may just unstick a stuck starter drive if that's the problem. Original Ford electric system is 6 volts with positive terminal to ground. Regards, Kevin.