new to me 1976 KZ 900, wires go where?

Run a ground wire from the battery negative post to the engine case

Thanks @Mikaw, the color schematic does help.

Tried to scan not sure is it’s readable. 
 If you both pm me your address I can email a pdf copy.

rscone11 email sent
 

wrote:

Ok, @F64 thank you for the help.  let me know when to put those wires back together.
I am attaching photos below of the headlight bucket, it's a bit of spaghetti.
It looks like the main blk/yel wire coming into the bucket from the main loom goes to the headlight wiring and a turn signal ground.


 

In the bottom photo I can see an unplugged plug.  Is that coming from your right control switch?  Why is it unplugged?  Where is the other end?

 

HRM, this connector in red circle? It’s the turn signal buzzer. 

@F64
Ground wire is now run from battery negative terminal to engine case.
Readings are
Red probe + , black probe  to neg - = 11.7v
Red probe on pos and black probe engine case = 11.6v

Does your neutral light come on?

@F 64 ,Neutral light comes on

Ok,
Reconnect that small black/yellow relay connector.
Take the jumper wire off that connects it to the negative battery post.
Put the big black cable from the starter back on the starter relay terminal.

Try to start the bike.

Ok, done
Ok,
Reconnect that small black/yellow relay connector. check
Take the jumper wire off that connects it to the negative battery post. check
Put the big black cable from the starter back on the starter relay terminal. this has been always connected, 

Try to start the bike. nothing