Re: Stop light and tail light problem
Bite the bullet and run ground wires from the frame or fender bolts to each light socket base. Using an ohmeter/continuity tester verify each ground is grounded. Remember the tail light is mounted to a bracket that has a rubber gasket between it and the fender. You should not assume the mounting bolts are in contact with the fender (ground). Once you have made certain all light bases are grounded then you only have to deal with one (-) 6volt wire.
The aftermarket rotary light switches are all pieces of junk to put it bluntly. I have had many problems with mine to the point where I have bypassed some of the connections by redirecting them to a toggle switch hidden under the dash. This arrangement works flawlessly.
You should also run a heavy gauge wire from the battery ground cable to an engine bolt. The engine theorectically could be electrically isolated from the frame as it is mounted on three nonconductive rubber pads. Doing this eliminates potential poor grounding related problems that could drive you crazy trying to resolve.
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