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The Motobrick Workshop / Re: 1999 K1100LT fuelling/ignition issue
« Last post by Scott_ on June 14, 2026, 11:07:06 PM »Also, replace all the fuses, even if they seem good, they're deliberately the weakest link in the system, so deliberately easy to get to.I dirty lamp socket connection can give the BMU issues.
I had a similar issue with my K100 that sat for years before I got it. After a while the issue disappeared, I think I shook the cobwebs out of it.
Does the tail go out, or go dim when the bulb monitor light goes on?
The bulb monitor warns you if the brake circuit, or tail light circuit is faulty, the second that the problem starts. After your two hour ride, the two hours of good vibrations may have loosened the earth connection at the plug in the tail piece. This sometimes results in parallel circuits turning into series circuits, with the voltage not being good enough.
Over the years I have read of others having issues with lamps that have a brass shell as opposed to the original nickel/polished lamp shell.
Also note that the BMU doesn't play nice with LED lamps without a load resistor(to fool the BMU).


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