PeachParts Mercedes-Benz Forum - View Single Post - 83 300sd Brake Lights Blown Fuse help please

JamesDean · #70 03-26-2012, 11:45 PM

I dont believe its your brake lights. I also dont have any other ideas at the moment.

When your brake lights are active they draw about 5 amps total or more if you have other lights wired in (fog light brake mod). Which is more than 50% of the 8 Amp fuse's capacity.

That leaves 3 amps left to whatever else is on the circuit. 3 amps for all the normal mercedes things. Now if something is amiss and is drawing more than 3 amps, when you add that extra 5 amp load, its going to pop the 8 amp fuse.

If you apply the brakes while parked and they don't blow the fuse then I don't think there's anything wrong with the wiring for them as none of that moves during transit.

I'll look back at the FSM and see if I can see anything else.