Coil mounts on the shroud on the front of the cylinder, that is why it has ground that is plastic. There should be a wiring diagram above in the stickies posts. More or less the power goes batt to key, then to pedal switch, then to solenoid for starter and the ignitor. Ignitor runs the coil and to crank trigger. Small wires from starter/gen go to voltage regulator on rear fender to charge batt.
Find that diagram, should be able (might be red striped wire) jump hot at key wires to the pedal and not need key for now. Ignitor is like a CDI, it is on gas tank.
http://www.cunninghamgolfcar.com/s-1...resources.aspx
Can also check out TNT golf cart site, they show a parts breakdown for all yamahas.