1983 Yamaha Excel III 340. I can’t get the electric start working. Brand new battery and universal solenoid, and I rebuilt the starter. Solenoid is clicking, and makes a humming noise. It is getting 12v at battery side of solenoid, and 4v at starter side. I switched the wires around and it does the same thing. I don’t know if I have something hooked up wrong or what. Any ideas? I don’t know much about electrical troubleshooting.