Vintage BMW Motorcycle Owners

download/file.php?id=35658

Look at last page from Dougs book
Simple diagram of dimmer switch bottom right corner

No power is ground
#31 is ground on headlight socket and to #31 ignition switch board
#56 Is power from ignition switch board to #56 on H/L switch
#56a and 56b on H/L switch to 56a and 56b headlight socket

All 4 terminals on the headlight socket should not have 6.5 volts
#31 on the headlight socket goes to ground (original should be a brown) and goes to #31 on ignition switch board

Salis Site

https://bmwclassicmotorcycles.com/index ... 1130007029

Wouldn't both plugs be fouled if the air filter
Was restricted not only left side ?

The magneto and the charging circuits are independent of each other so no the voltage regulator would not be the problem

The headlight works when running or not running

Headlight should go on as long as you have a good battery, key is down and turned clockwise

Cory Welcome Back Great looking bike The white wire from the high beam indicator light should go to 56a on the terminal board, power from 56a on the h/l flasher switch and also to the original white 56a on the headlight bulb bulb/socket The yellow low beam wire should connect to 56b on the headlight...

#1 to HO switch board
#3 to 56 switch board
#2 To 56a Headlight bulb
#4 To 56b Headlight bulb
Also Salis site shows how to remove and insert switch

https://bmwclassicmotorcycles.com/index ... arket.html

Glad you got it !!!!
Of course bad part out of box !!

Glad I read your last post
Was about to post some more bad advice and was running out of things to suggest

Great post, learn something new everyday

srankin wrote: ↑

Thu Apr 18, 2024 7:16 pm

Also check the gray wire's position on the back of the ignition switch. 58. if it is accidentally plugged into the spare 30 plug (red), it will energize the circuit even with the key off. St.

sranklin
Good point
POD
Did you have these problems when you received your bike or after