use an ohmmeter for resistance checks, clean all the corrosion inside the butt connectors,,i made a complete new harness out of brand new wire using a choppers site diagram,slickschoppers.com has one,swapped the original starter solenoid for a Ford fender style one.made it keyless with hidden switches,the hard part was the charging system but study the charging wiring system its not that complicated,, my bike runs like a Caddilac like the saying goes,no wait bike runs like a Honda is a better saying, i added a voltmeter to the cluster which comes in very handy knowing exactly how much voltage is at the coils,goodluck