Third Fuse on the Airhead

[montmil]

A recent and brief conversation on the BMW Airlist dealt with a question of a fuse requirement on an owner's Airhead. Most all of us here in the R65 Asylum are aware of the two, sometimes troublesome, "euro" fuses on our favored BMW. Tom Cutter, of Rubber Chicken Racing fame shared:

The third fuse is harder to spot. It is the entire wiring harness. When too much volts and amps find a momentary escape route, the harness melts and stops that flow.

Easy Peasy.

Tom Cutter
Yardley, PA

That's for sure. That's fer danged sure. [smiley=furious3.gif]

[Matt Chapter]

I did that once, troubleshooting my headlight.  One of the worst smells in human history, reminiscent of odeur de poop, letting you know that whatever problem you had, it's suddenly and catastrophically gotten much much worse.

A call to re-psycle and some $$$ and time later, new wiring harness fixed the problem.

[Bob_Roller]

I'm very surprised that the headlight circuit does not have a fuse .
It's one of the highest current drawing circuits and on all the time .
I've gone to relays in the headlight circuit, the headlight switch sends power to the relay to close it, the electrical load goes through wires directly from the battery have a 10 amp fuse .
There are aftermarket wire harnesses available, that all you do, is remove the connector from the headlight, plug the new harness into the headlight connector and then put the connector on the new harness back on the headlight, run two wires back to the battery, there is an inline fuse on these wires .

www.easternbeaver.com