After spending all night with very little info and only a partial wiring diagram off the internet, I too am having electrical troubles with my lighting on a dt100/ the diagrams show that the dt175 and the dt100 have the same wiring. After highlighting the diagrams and tracing the wires on the bike, I have come to the same conclusion that the headlight and the running lights in the speedomitor and the high beam indicator light all work of of the magneto with AC electricity. While the tail light, horn, neutral light and flasher system along with the stop lights are on a 6v dc system. Both systems interface with the diode rectifier.
My trouble is that I have no information and haven't been able to find anything substantial. Even our large library was very limited and all i can come up with on the internet is a parts catalog. If you know of a source of information, a good wiring diagram or manual for these bikes, please notify me.
What I could really use is the specifications for the head light and other ac lights. I do not have the old headlight.
Do you know or have you measured the ac voltages that are correct on the yellow white lead out of the magneto and the dc voltages to the battery on the red lead after the diode rectifier?
This would all be of great help?
If any of this is incorrect,(and it could possibly be that way, since every thing i have is from tracing wires and adding too/making a sketch) please tell me were i am wrong.
thanks in advance for any help you might have
Rex