HeadLight for cb750A

[zonson]

My head light went out, fuse was blown replaced it still not working, its a 1977 hondamatic. We figured it was the green wire, though not sure if the green wire is a ground wire or not. White and blue get power just not the green. Any other input?

[Piute]

http://search.yahoo.com/search?p=1977+hondamatic+wiring&b=&fr=ie8

[Hoosier Daddy]

 Green is ground, so it will not have power. Take a test light and go from the white or blue to the green and see if it lights up... if so you headlamp is bad. If not, since you know you have power at the white and blue wires, start tracing back the green and see where you are loosing ground.
 Now, a loss of ground explains why it is not lighting up but not why it blew the fuse. even if the green wire is pinched/ chaffed/ cut and shorting to ground will not take out a fuse.
 You need to check the white / blue wires or switch for a pinch / cut / chaff that allowed the short or high resistance that caused the amperage to go high enough to take out the fuse.

You really need a wiring diagram (Piutes post)
Here is a linky to one... too big to paste direct, it'd clog up your post.
http://www.oregonmotorcycleparts.com/files/CB750auto.jpg 

[zonson]

Thanks, I was trying to not have to trace the green wire since the guy before me just about cut spliced and doctored all the wiring. Well guess not getting around it then. Just may have to run a whole new ground al together then. Thank you so much brothers of mechanics. Enjoy the Ride!

[zonson]

Well I take that back, My ignition switch just blew out also. so then I take it then that there is def. a an exposed wire somewhere.