I`m sure it is a fuse because the neutral lite also does not work. Out side of that, I have no idear where to start looking. I had a blown the fuse for the horn / break lite the other day. Replaced 10 A and no problem as of now. Any and all help will be great. I kinda get a brain freeze when it comes to elect.`s on bikes and cars, so I really need a guiding hand.

Thanks in advance.
Don NEVER MIND ! I found that it is a blown fuse. I had bought a LED break and tail light from Custom Dynamics. It appears that the LED is shorting out in the taillight mode. Works in break mode. Unit did work for about three days. Guess nothing last forever.

Wonder it I can get anything out of CustomDynamics.com
BTW, tach & taillight on same fuse. 10A