Crazy Light Problems

[McFearless]

Hey all! First post here.

I just purchased a 78 cb750k 2 weeks ago. The bike performed well for the first week of ownership. However, I am experiencing some electical issues now. I started working on it by installing a new battery which has helped a little but hasn't solved all of the issues.  

Here is the lowdown: 
No neutral/oil light unless front brake lever is pressed.
No brake light when front brake is pressed.
No "running" tail light.
Brake light comes on when rear brake is pressed.

Any suggestions? Bike runs great but has these annoying issues.

[Re-run]

OK, well the no brake light on front brake is usually the plunger switch. If you look under the lever/master, you will see a small switch that is actuated by the lever. It is likely bad. Though, the oil light makes me think someone tried to do their own wiring and plugged things into the wrong connections. These 2 issues may be related.

No running tail light, I would pull the cover off and check the bulb, may as well replace it. I have had bulbs look perfectly fine but not actually be any good.

Brake light should come on when rear pedal is pressed. There is a pull switch that uses a spring hooked to it and the rear pedal.

I would suggest getting the wiring diagram here and pull the head light out and do some tracing. These issues won't be solved by any battery. They are wiring.

[rich]

Manuals and wiring diagrams can be downloaded here http://honda-cb750-s.456789.n3.nabble.com/NEW-Repair-manuals-Other-write-ups-too-Updated-04-26-2014-td685918.html

Click on the K-8 wiring diagram link, that's the one you need.

Sounds like someone just plugged in the wires in the headlight bucket randomly. I'd start there, with diagram, and make sure all the connections are correct.

[cblover]

It could be a simple blown fuse. Rich url link will surely be helpful to your diagnosis.