K11 Owners Group

Brawls · Posted: Fri Aug 30, 2013 2:17 pm Post subject: tail lamp inoperative

Well I discovered today that my tail lamp no longer works. I replaced the bulb with a different one known to be good - still nothing. Looking at the Clymer's manual it seems the bulb is controlled via a gray/black wire from the "bulb monitoring unit". All my other bulbs / functions operate normally and I had no indication on the dash of a burned out bulb.

Is it possible the bulb monitoring unit is faulty?

TIA,
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Blair Rawls
95 K1100RS

Flying Duck · Posted: Fri Aug 30, 2013 2:47 pm Post subject:

Do you have rear Run-N-Lites? If the tail light goes out but the Run-N-Lites are working then the current goes through them and keeps the BMU happy.

Or the BMU could be bad.

Pull the BMU and test for continuity from the terminal in the connector to the tail light to make sure the wire is good.
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93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Brawls · Posted: Fri Aug 30, 2013 8:48 pm Post subject:

Thanks Duck. Many times when troubleshooting a problem my dad would say "Check the easy and obvious things first." And many time I forget such good advice. I thought I had checked Fuse #2 earlier today, but must not have because when I pulled it later this afternoon and put the meter on it, no continuity. Installed a new fuse and voila - Lights!

I don't have Run-N-Lites but do have the K-2 Tail upgrade. The brake lights worked, but no tail lights until the new fuse. Now all is good.
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Blair Rawls
95 K1100RS

RJTrucker · Posted: Mon Sep 02, 2013 3:34 pm Post subject:

That K2 tail light upgrade is great. I have it on all of my K Bikes.
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Ron
1993 K11LT
1985 K100RS with over 100K on it
1985 K100RS Luftmiester Turbo Work in progress (any help is appreciated)
1974 R90/6