eletrical

[ant75]

hi, all ive just bought some raceing rear sets for me nc30 2 use on the road,and they dont have anything on them for the brake light switch,so i bought a hydraulic switch but it keeps blowing the 15amp fuse in the box swapped wires around and still does it any1 have any ideas 2 why? thanks.

[magg]

Do you mean when you wire in the hydraulic switch the fuse blows or only when you press on the brake lever.

[CMSMJ1]

it might be touching the frame..see if it has clearance

[ant75]

only does it when i touch front or rear brake.

[CMSMJ1]

Something not right then - why should the front brake affect the rear switch?

I reckon there is a short circuit in the system

[amorti]

Something not right then - why should the front brake affect the rear switch?

I reckon there is a short circuit in the system

Sometimes you can get a very weird fault... the brake light filament will fail, and the remains of it will burn themselves onto the taillight filament. When you add +12v through the brake light filament, so that creates a short.

Does it do this if you unplug the switch?

Are the two wires into the switch well insulated?

[Morespeedvicar]

Is the hydralic switch a single wire car one, or a two wire one? If its a two wire switch, you deffo got a short somewere. time to dig out the multimeter.
Cheers
Ian

[ant75]

when its unpulgged its fine,so just 2 check i plugged the original 1 in and dont blow anything,its a 2 wire hydraulic switch.

[magg]

Do you have a multimeter, if so check if either of the switch wires has continuity to the body of the switch.

[ant75]

cheers for ye help,im lucky i have another bike 2 ride as this is me project and 2 b honest its totally pissed me off the switch il sort but trying 2 get it 2 rev cleanly is the biggest problem ive checked mostly everything from wireing reg/rec carbs coils, speedo but she still wont rev cleanly i dont have the spare cash 2 get her in the garage,this must b doin everybodys heads in on here