MOTOBRICK.COM
TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: henbird57 on March 09, 2025, 07:50:02 PM
-
1993 K1100RS -I never have noticed a bulb warning light on the speedometer even when my headlight connector was separated from the bulb. There isn't even the logo in the lower right corner of the speedometer that I have seen on other models(K100). Previous owner has added after market pulsing brake lights. It has been this way since I bought it in 2012. Recently the fuse for tail light will blow when immediately starting the bike. Suspecting he did something with the BMU as I have seen suggested on this site in previous posts. Is this where I should begin?
-
BMU has nothing to do with the headlight. It only monitors the tail and brake light bulbs as well as the brake switches.
Learn more here:
https://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/bmu/bmu.htm
It's not common but it is possible that the insulation from the BMU to the taillight has worn and is grounding to the frame.
First thing I would do is pull the BMU and see if the gray/black wire shorts to ground.
-
Thanks frankenduck, I will let you know how it all worked out.
-
Your diagnosis was correct Frankenduck. Ran another wire to replace, all good now. Thank you. Collie pup and a collie flower for you!
-
Glad that my Internet diagnosis worked for you.
(That Collie-flower poem is a dad joke that I had to endure WAY too many times in my life. Almost daily.)