Originally Posted by Steve G.
Are you talking about the black wire that goes to the switched power? I've got that spliced into the coil +, which is a solid green wire on '91 GS's. Seems solid. I'll double check it. Maybe I should go big guage wire on that one as well?
Yes. Just to test, clip it to the + on the battery directly. Make sure the plug attached to the wire is not the one it came with. Clip it off, strip the end and attach to battery plus. Remove all intermediate steps... just to test.