Everytime I apllie my rear brake on a 2003 HD Electric Standard FLHT it blows my 15 amp fuse in my fuse box which is my accessory fuse. Change out already brake light switch and it still blows the fuse. need help any ideals?

 

This happened to my 2001 ultra when I had the module installed that turned all rear lights into brake lights .I removed the module that lit all the rear lights up and have never blown a fuse since.

 

could have a bare wire rubbing the frame start with an ohm meter after the switch to ground...

 

I'd look for a bare spot on the wire from the brake switch to the brake light. Because it sounds like a short to me.


Cpt Itch: We are on the same wavelength.

 

Yep. That's a dead short. Hole in the wire somewhere I would imagine.

 

I'll go with the bare wire theory.

My ultra kept blowing tail lighting fuses.

Problem turned out to be bare wires as a result of the wheel bottoming out with the under fender.

I replaced and moved the wiring harness from under the fender to the top of the fender.

 

When that happened to me I found it to be the wire loom that connects to the rear brake light switch was rubbing against the bolt that holds the exhaust to the bracket at the tranny and had rubbed through.

 

It will make it a lot easier to ohm out if you remove the bulb before you ohm it. If you don't you will be reading to ground through the bulb.

 

Yep, and make sure you are ohming the hot wire,,and not the ground side of the socket....

Yes,, a blown fuse, is a short. Not many if ands or butts about it. Put the Ohm meter on it, have someone hold the brake down. *DO NOT HAVE THE KEY ON* While looking at the meter, slowly start tracing back on the harness. As you move things, look at the meter. When you see the short disappear look at that area closely. (Do not tug on the harness, where when you move it, it moves for 18" each way,, if you get my drift.) I know there are not that many long runs, but you see why. Your trying to isolate the spot where the short is. You know,,,, if it's only when the rear brake is applied. Your better off getting a good wire diagram and seeing what wires are common to the rear only.....

 

same thing happened to me. i had a wire under the seat which had pinched and exposed. check the wiring.