Motorcycle Questions? Ask a Mechanic.
Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, let's try check and review the basics. Proposed preliminary tries (if have not been done):
In some instance and/or even if just for test purposes, hardwire a secondary fround line from the battery's - terminal to the frame and to the engine and to the harness' black/yellow wires