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Since your bike is not stock, these guys can supply you a wide range of ignition products and connectors, sensors etc. 

www.ignitech.cz/en/vyrobky

The wiring on older bikes is the Devils spaghetti.As Kawboy says, it’s most likely something simple. I had similar problems with my old Z1000j, it turned out it was a single black wire that had come loose. 
 

Thanks,  LareNuminen, I will definitely check them out. 
McZee, that's an awesome chart!  I haven't laughed that hard in awhile.   I too had a J model. I loved that bike and wish I hadn't sold it. I was seduced in to doing so by a near pristine '79 MGB roadster.

So, what's the latest on this topic 81barnfind?