My '88 K75S sometimes just dies as I'm running down the road. While still rolling,
I pull the clutch, turn the ignition off and back on, restart the engine, and keep going.
Thought I had it figured out - my ignition key fob was flopping wildly in the wind.
Thought it was actually turning the ignition switch off. Started using the original folding key with no fob and all was well for awhile - but now it's back, and sometimes even happens when I'm stopped. Seems like sometimes it goes completely dead - no instrument cluster lights remain on - and other times the battery light stays on but dims.
As soon as I turn the ignition off then back on, all's well for awhile. The battery is practically new. Sure hope someone can help. With two kids in college, the local BMW shop is usually out of reach financially.
Thanks in advance to those of you with the practical knowledge I wish I had.