dt100 Posted September 11, 2007 Share Posted September 11, 2007 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 Link to comment Share on other sites More sharing options...
81dt Posted November 15, 2007 Share Posted November 15, 2007 give us your email mate ill send u a 250 diagram its exactly the same as te 175, i just re wired mine and everything worked off the magneto, ill used it and it worked great Link to comment Share on other sites More sharing options...
mog8a Posted August 11, 2008 Share Posted August 11, 2008 [email protected] I have the same problem and will take a copy if you would. thanx in advance. give us your email mate ill send u a 250 diagram its exactly the same as te 175, i just re wired mine and everything worked off the magneto, ill used it and it worked great Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 12, 2008 Moderator Share Posted August 12, 2008 [email protected] I have the same problem and will take a copy if you would. thanx in advance. Theres a manual on ebay Here There will be an electric circuit diagram in there Link to comment Share on other sites More sharing options...
dt100 Posted April 25, 2009 Author Share Posted April 25, 2009 I finally found the problem. it ended up in the light switch in the handle bar. inside the switch there is a fixed plate and a slider that rubs against it. this directs the electrical path of the magneto to one of 2 chioces. my plate had gotten old and warped. it made no connection at all . when the switch was turned on, the magneto started putting out a very high voltage that would burn out all the lights associated with it. (all the ac lights on the bike). I took the switch plate out and put it in a press to take out the warp. ( I actually warped it the othe direction slightly.) It then made a good conection which ever way the switch was moved. I repalced all the bulbs but never did find the correct headlight bulb. I used a sustitue instead. The Yamaha shop wanted $125.00 to order in a new headlight bulb. I thought that was a little steep. I could still use a lot of info on this bike. any shcematic would be apreciated. email me at [email protected] thanks for everyones help Link to comment Share on other sites More sharing options...
dt100 Posted April 25, 2009 Author Share Posted April 25, 2009 give us your email mate ill send u a 250 diagram its exactly the same as te 175, i just re wired mine and everything worked off the magneto, ill used it and it worked great I fainnaly fixed the trouble but still have questions. Your schematic would be a big help [email protected] thanks Link to comment Share on other sites More sharing options...
miut Posted June 18, 2009 Share Posted June 18, 2009 give us your email mate ill send u a 250 diagram its exactly the same as te 175, i just re wired mine and everything worked off the magneto, ill used it and it worked great Just wondering if i could get that diagram too. much appreciated. [email protected] Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted June 18, 2009 Moderator Share Posted June 18, 2009 DT175 wiring Here DT250 wiring Here Models differ so these are guides only. Click the picture to zoom. Link to comment Share on other sites More sharing options...
4Skins Posted April 8, 2013 Share Posted April 8, 2013 give us your email mate ill send u a 250 diagram its exactly the same as te 175, i just re wired mine and everything worked off the magneto, ill used it and it worked great Gidday from NZ. Do you still have a copy of this wiring diagram. I need to fix the lights on my DT175G and am trying to track down the diagram. Would appreciate a copy if you have one (or something similar. Link to comment Share on other sites More sharing options...
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