Never A Bulb Warning Light

[henbird57]

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?

[frankenduck]

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.

[henbird57]

Thanks frankenduck, I will let you know how it all worked out.

[henbird57]

Your diagnosis was correct Frankenduck.  Ran another wire to replace, all good now. Thank you.  Collie pup and a collie flower for you!

[frankenduck]

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.)