I'm working on my grandfather's 1927 T and have run into an issue with the electrical. When I turn the ignition switch to battery the 25 amp fuse wired into the starter switch wire (terminal block #3) blows. The key itself can be turned, the coils buzz, the lights and horn work, but as soon as I turn the switch to battery it fries, my grandfather had a staple in lieu of a fuse previously. I put a new 1/0 cable from the battery to the starter switch today and it is still blowing the fuse. I'm hoping someone here will have some idea where to go from here?
The lever that is below the key is the headlamp switch. I would start by removing the bulbs from the headlamps and tail lamp. Make sure the switch is OFF.
Then, using an ohm meter, measure the resistance to ground on each of the bulb terminals. It should be an infinite amount of resistance. One of the wires is going to show a low amount of resistance. That would likely be the problem.
I would disconnect the wire from the ammeter to the cutout first.
The generator is a dead short, if the engine is not running at a fast idle.
Thanks you guys. I don't know how but I didn't realize that was the headlight switch. I've tried to refrain from asking stupid questions while working on this car, but it looks like I finally did. Seems pretty likely to simply be the lights. Thanks very much for the help.