GT/S/SF Lamp Circuit Board Removal?

Gerald

Gerald

Hero member
Greetings
Need some help here. Replaced the bar end turn signals on my 71 SF with turn signals on stalks, screwed into the headlight shell.
When I turn on low beam or parking light the turn signals come on as well, but not flashing.
Turns out the headlight shell has 11.9 Volts to ground!!! (DPO arrg!)
Tracing back the origin of the problem I think an insulating plastic washer (or lack thereof) in the key switch may be the culprit.
Looking at the assembly I can't see how the circuit board is secured to the headlight shell.
Online BMW diagrams with the same lamp don't reveal much.

All help appreciated

Gerald
 
Run a dedicated ground wire (even temporarily) into the headlight and turn signals and see if it fixes it. That's a classic bad ground symptom. I'm not familiar with the earlier bikes but most Laverdas pre-RGS did not have a ground wire into the headlight and relied on ground via the steering head bearings. First thing I do with those is thread a nice fat 2mm2 ground wire into the loom to the headlight and remake all the grounds in there.
 
Steve,
Was the first thing I did, no change. Problem is a live feed of 11.9 Volts to the shell when the lights get turned on.
Points to the switch/circuit board, hence my question.

Gerald
 
Gerald,

Looking from below, you should find 4 steel tangs, on a diagonal line between board corners and about 4mm wide, going through the board and bent over to secure it.

piet
 
Thanks all,
Figured it out in the meantime. Board seems to have issues, dead short from + to the adjacent - post. Luckily have a spare board on hand.

Gerald
 
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