I doubt that you need a new ignition switch...
...your symptoms sound more like something is just wired wrong. That's what I was trying to establish.
I didn't look up your bike's actual wiring diagram, but I don't recall any BMW's having a white wire going to the ignition switch.
Could also be a faulty load reduction or headlight relay, or most likely (very common) a bad ground on one of those relays.
starter kicks in when I plug the head light in
Re: starter kicks in when I plug the head light in
Mechanic from Hell
"I remember every raging second of it...
My bike was on fire, the road was on fire, and I was on fire.
It was the best ride ever!"
"I remember every raging second of it...
My bike was on fire, the road was on fire, and I was on fire.
It was the best ride ever!"