I think that blue wire going to the other side of the handlebars is for the starter lockout switch on the clutch...it's in series through several switches....kill switch, starter button, clutch switch...... Not even sure the Z1's had the clutch switch actually..... :S

Wiring bites donkey ass!!!
The double socket for the blue wires is on the diagram, right close to the "Headligth switch". One blue wire is spliced into a red wire that comes out of the head ligth switch, then goes into a blue that goes into the double socket, and carries on in a different direction as red, into another blue. Ya!! frik!!
I ended up buying origianl handle bar switches, and complete wiring harnesses. Was having TOO many issues with wiring!!
The Z1 900 only had the one fuse (20 amp) off the main wire from the battery. That is all this bike ever had.
The KZ900 and KZ1000 used a 3-fuse block. These appeaered in 1976.
Z1 900 and KZ900 harnesses are different.
I ran into this fuse block problem, my bike came in a couple boxes of parts. And, a couple badly spliced together wiring harnesses!!
Best way to figure out what engine/ frame you have is by the numbers:
For example:
my frame is a Z1F 71862. This 5 digit number signifies that my frame is a 1973 Z1 frame.
my engine is a Z1E 072047. The Z1's production line started with Z1E047500. My engine number indicates that my engine is a late model 1975 production.
So, I have a 1973 frame with a 1975 engine.
1975 Z1's had the elctrics all on the right hand side of the battery holder.

When you get into the wiring for the rectifier, generator, regulator blah, blah, blah.... I had all from different model and year of bikes. From what i understand they all do the same thing, and are interchangeable amongst the years and models, but the wiring attached to them are/ might be different colors. Just a little more to confuse things!

Z1 Enterprises is a great source for parts and knowledge. If you ever get completely stumped!

PO stands for "Pissed Off that I did not take better notes" when I took it apart ten yeas ago.

J/k.. I have learned some things so far, the blue wire is hot for all lighting. Black with yellow stripe is ground for all lighting. What I thought was the brake switch for the rear is actually the flasher for signal lights.

The diagram you posted is the same one I am using as a guide, but mine is paper and about 20 years old. So tomorrow at work I will make an 11x17 print of the file you have posted here, that should really help.

It is just going to take time. I have all the wiring from the center of the frame back to the tail figured out. The turn signals front and rear , and the headlight.

I think the instrument lighting is all that's left. I am putting printed labels on the ends, so I can double check as I install lighting.

Some of it is just freaky though. Like there is a single blue wire that goes from the head light switch over to the other handlebar switch, into a double. The diagram shows no doubles, so I just hook it up and hope the fuse does not blow. Why you would need one wire to cross over is well..strange.

I am going to install a 10 amp fuse so if I short anything I will know right away without damaging anything.

I have only One fuse, a 20 amp main on the white main power wire. I think the other three fuses went away when I installed the new regulator rectifier. That blows me away too, the bike in stock form has three fuses, so what are the other two protecting?

Thanks for the help. This is going to be a long puzzle.

I went with a Gsxr1100 arm and a Zx6D rear rim with factory dual shocks. I have a Gsxr750 (shorter) swingarm with all the mono-shock linkage waiting on a shelf to someday be installed with a bolt-in kit I want to design.

Later, Doug

Very interesting. I converted a new Z1 rh switch to work on my MKII. I wired it so the PO is like parking lights, tail light and running lights but no headlight. Then I have On and Off. Couldn't turn off the headlight the way it came from Kaw.

79MKII wrote: Sorry to change the subject, but on a side note....what does the "PO" stand for on the headlight switch? I've always wondered that......

From what I understand, PO was the beginning ofthe "always on" head lamps, the original bikes, they had a small lamp i n the head light that you could turn on and off and not use your main head light.
Same idea as the daytime driving lights.

Sorry to change the subject, but on a side note....what does the "PO" stand for on the headlight switch? I've always wondered that......

i have the manual in e form if you need anything else from it.
leon

Here is a couple things for you to look at. Maybe you have seen them before.
The wiring diagram I have been using, and seems to be exact to original
The guys at Z1 Enterprises are awesome if you haven't already checked them out.

Wiring wiring !!!

I need a good wiring diagram for the 75 Z1B...

There are so many ends and they make no sense. Ten years ago they made sense. Its just the lighting, I have the ignition and charging system wired and working very well.

HELP !!