BMW K bikes (Bricks)

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The typical way to set up headlight relays is to have a low beam relay and a high beam relay. BUT, if the switch still fails then you may not have any headlight at all. Wring the relays as below ensures that, even if the switch fails, you will at least have a low beam.

The upper 5 pin relay switches power from the low beam to the high beam when either high beam switch in engaged. The lower relay turns off the headlight when starting as usual.

Or, if your switch has already failed so that the low beam doesn't work but the high beam stills does work then you could install relays this way and not have to replace the left combo switch.

Alternate (better?) headlight relay configuration Hl.rel2

Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT


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@Duck:  That is an innovative circuit.  I like the idea of fail-safe to low beams instead of a completely dead headlamp.  I guess I have a new project in store for 2023.

1987 K75

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