Question about Yamaha DT 360 Motorcycles

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I have a 1977 Yamaha DT 400 that I'm trying to get back on the road. I an having troubles with getting the headlight to work at all. Ive checked the obvious thing first, the headlight itself is good, I've replaced the battery and the 10 amp inline fuse was blown, (maybe a clue?) so i replaced it with new one. All of the other accessories work. The indicators blink, the running and brake light works, just no power to the headlight. I've also checked that there's a good ground to the headlight plug, checked fine. I have the tank off and I have access to the complete harness all the way up the bike and it shows no worn spots where there could be a short inside the harness. It must be something simple that I've overlooked, like the rectifier or maybe a common failure known only to Yamaha DT experts. It is a 6 volt system, if that helps anyone. Thanks in advance for your responses.. Mark.

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This is an overly simplified schematic: http://www.slimduck.com/dt360_wiring.html

This one shows the ignition and low/high beam switches:
http://www.slimduck.com/dt1-wiring.gif

One of the things you might want to look at is the High / low beam switch in the grip. Corrosion or a broken wire in that area will prevent the light from working.

These parts electrical parts diagrams may also help:

http://www.mrcycles.com/fiche_section_detail.asp?section=1648&category=Motorcycles&make=YAMAHA&year=1977&fveh=47

http://www.mrcycles.com/fiche_section_detail.asp?section=1647&category=Motorcycles&make=YAMAHA&year=1977&fveh=47

Your best bet at troubleshooting is to chase 6V power with a meter or test lamp all the way through to the ground for the head light.

Thanks for using FixYa.

Kelly

Posted on Jun 14, 2010

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