Ok so a buddy of mine wanted me to throw this up. He has a dyna 02 low and his speedo tach and blinker fuse keeps blowing when he hits the rear brake peddle. He disconnects the rear brake and everything works fine tail light andd tach. Once he plugs it back in on the bottom and press the rear brake peddle it blows fuse any ideas where this short could be cuz everything looks ok with the wires?

 

has to be grounding out... from the brake light switch back trace the wires you will find either a slice or bare wire somewhere

 

Does the rear brake light function normally with the hand brake? This will give you a better idea of what direction to look.

 

If the rear of the bike has been lowered , the wires may be damaged from having bottomed out, and or the harness may have dropped in the rear fender.

 

My first thought. Take a good look under the fender.

 

Ok guys good info but already checked and bike has not been lowered and wires all intact sooooo?

 

Have you looked inside the rear taillight, thats where the wires all end up to a connector block, if you ruled out the rear harness then time to follow the wires that go to the rear brake light switch that is just beside the brake master.

 

Hey guys thanks im gonna helo him out on satersay so i just wanted some info from u guys cuz i always get good info from all thanx agai and ill check.

 

Could be an 1156 bulb (single filament) in an 1157 (dual filament) socket. An 1156 Bulb will bridge the two terminals in an 1157 socket. This will cause all sorts of havoc depending on how the motorcycle (or car) is wired. This is technically called a "Short to Power" problem.

-or-

Disconnect the Battery Ground (-) Cable at the Battery . . . VERY important to do this first (it's the Black one) . . . then attach an Ohmmeter between either Bake Light Wire and the disconnected Battery Ground (-) Cable. Press on the Brake Pedal . . . if the Ohmmeter reading changes, and the likely change is that it will go to zero or nearly zero . . . you have a Short to Ground somewhere in the Brake Light Circuit.

 

[QUOTE=Bluehighways;10434903]Could be an 1156 bulb (single filament) in an 1157 (dual filament) socket. An 1156 Bulb will bridge the two terminals in an 1157 socket. This will cause all sorts of havoc depending on how the motorcycle (or car) is wired. This is technically called a "Short to Power" problem.

-or-

Disconnect the Battery Ground (-) Cable at the Battery . . . VERY important to do this first (it's the Black one) . . . then attach an Ohmmeter between either Bake Light Wire and the disconnected Battery Ground (-) Cable. Press on the Brake Pedal . . . if the Ohmmeter reading changes, and the likely change is that it will go to zero or nearly zero . . . you have a Short to Ground somewhere in the Brake Light Circuit.[/QUOTE


Thanx for the info when it comes to electrical I'm horrible so thanx guys.