1927 Electrical Short, Blown Fuse

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2016: 1927 Electrical Short, Blown Fuse
Top of pagePrevious messageNext messageBottom of page Link to this message  By Robert Stearns on Saturday, April 09, 2016 - 04:46 pm:

Hi,
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?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Saturday, April 09, 2016 - 05:35 pm:

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.


Top of pagePrevious messageNext messageBottom of page Link to this message  By James A. Golden on Saturday, April 09, 2016 - 06:09 pm:

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.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Robert Stearns on Sunday, April 10, 2016 - 12:05 am:

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.


Add a Message


This is a private posting area. Only registered users and moderators may post messages here.
Username:  
Password:

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration