No power at headlight???

[loka]

Putting the bike back together i have all the electrical working except for the headlight circuit. The harness is new and everything else works.
Consulting the wiring diagram for K1-K5 Cb750 it looks like power for the headlight circuit happens at a connection point from the tach light circuit somewhere on the bike.
Tach circuit BR/W connects to Headlight circuit BR/R before being fused to the headlight switch - Where does this happen? Logically in the headlight bucket but i am stumped.

Help

 

[crazypj]

Brown/white is sidelight/running light/tail light circuit.
Without looking it up, you should have a black wire running into right bar, (on off switch if its pre 'lights on') probably Br/R wire running from there to left bar, then white and a blue to run high low beam ( they will connect either under tank or in headlight.

PJ

 

[loka]

I should mention that i also have no power at the fuse, either side. I am looking at my clymer manual and the Br/w is strictly tach/speedo backlight. Br is taillight.
The diagram shows br/w from ignition switch to br/r to fuse to headlight dimming switch.
The power somehow gets to the tach/speedo backlights but does not make it to the fuse to power the hl switch

 

[crazypj]

you do have instrument bulbs in place?
from what you describe it has to go through a bulb to make circuit (I don't remeber that)
Instruments should be on their own circuit.
Either harness is faulty or you have something mismatched?
Quickest thing to do would be check harness for breaks, (use ohm meter and continuity check each wire end to end)
I forgot Honda use brown to tail light, Yamaha use brown/white trace.

PJ

 

[loka]

The circuit is odd for sure.
power comes from the blk regulator into the headlight control (tach lights) switched to br/w then down the line br/w to br/r then fused before it goes into the headlight dimming switch.

GOT IT!

The new harness had wrong ends which caused me to second guess myself. Sometimes it's hard to see the forest thru the trees, but thanks for playing sounding board.

cheers,
Jame