Pro electrician advice

[jerryb]

Arail7Black

Because of charging considerations upon using electric clothing I wired a toggle shut off switch into my 1990 R100GSPD headlight circuit.
An electrician friend OK'd splicing into one of the brown ground wires to complete the circuit, Wrong!
The fuse would blow intermittently (partly) because a significant amount of green wire uner the gas tank had to heat up and melt insulation, etc. sufficiently first.
It's been a while but it seems to me it didn't matter if the headlight was on or off to create problems.
My last advice was that the grounding system on a BMW could confound even a pro electrician not familiar with it, so be careful!

jerryb

[lkchris]

Arail7Black

Because of charging considerations upon using electric clothing I wired a toggle shut off switch into my 1990 R100GSPD headlight circuit.
An electrician friend OK'd splicing into one of the brown ground wires to complete the circuit, Wrong!
The fuse would blow intermittently (partly) because a significant amount of green wire uner the gas tank had to heat up and melt insulation, etc. sufficiently first.
It's been a while but it seems to me it didn't matter if the headlight was on or off to create problems.
My last advice was that the grounding system on a BMW could confound even a pro electrician not familiar with it, so be careful!

jerryb

Every ground wire on every German vehicle is brown. What's so confusing about that?

The REAL headlight on-off switch for a GS is a 5-postion ignition switch.

[CustomSarge]

Power feed (green) wire melting its' insulation & subsequent fuse blow, suggests too small a gauge for the current. Heating stuff at low voltage saws off Big amps: use a relay & larger gauge wire.... G.H. <<<)))