Vintage BMW Motorcycle Owners

Thx guys I feared it would be a brute force "check everything" scenario but was hoping for a telltale sign I wasn't aware of. I'll start with cheap and easy and go down the line. Systematic isolation of variables. Experience says it'll be something dumb. I'll report back when discovered.

1964 r50/2 Magneto ignition with fresh coil Rocky point ignition switch 12v system with "lathed" 1980's airhead rotor and stator with under-tank regulator. Harms points plate. Everything but crank and heads done by your truly since it was built from a frame and 15 boxes of parts in 2005 er...

https://photos.smugmug.com/Motorcycles/1964-R50-Restoration/R50-Wiring-and-Electrics/i-nvNDqTb/0/8ceba6cd/O/Schematic.jpg A user named Pokie on the advrider forum helped me with this. His instructions that i followed using the schematic are below: *** Select a wire that is powered when the ignition...

let me pull some pics and get info to you

well, I got some tips from another airhead that does this routinely for people. I installed a dual pole relay in the bucket that keeps the brown/black wire to the coil/magneto "open" when the switch is on and grounds the magneto when i turn the key to off. Works like a champ and didn't hav...

I have a few from when i did this on my R50/2 with a new harness. A couple key shots below. Ignore the r100 rotor and 12v system under the tank but the under tank photo is one of the best guides besides the cartoon images already posted. I have more as well as tons of photos from the Spartnburg, SC ...

Any tips or pictures of where you installed the switch and/or relay to ground the magneto?

Nevermind
Pulled the board and will be installing the rocky point kit.

I'm going to try troubleshooting y rebuilding the sloppy key switch guts While I'm in there I found that I have a voltage drop. When key is in and lights off: Between 30/51 and 56 I get 12.6v When key turns to lights on voltage drops to 11.88v This is with no headlight installed. It's on the bench.

Thx much for the link