Keep the thoughts coming. I have a little more time to type now.

Right now the instrument cluster is plugged in and all the lights work on it. The tail light also works. The handle bar control is unplugged. Everything is fine and the fuse doesn't blow.

As soon as I plug in the handlebar control it will blow the fuse when the ignition is turned on. I took apart the control and traced each wire. None seem to be kinked bad or worn. They also seem to be secure at each end. I also put a new end terminal on the ground wire. I also went as far as to cut each wire and put disconnect terminals on them so I could pull them one by one to diagnose. With ALL the wires disconnected at my quick disconnect terminals (except the ground) I plugged in the main handlebar control harness and tried it. It will still blow the fuse with ALL the wires disconnected!?!?!?!

Do you think the short is in the harness connections?

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R