Any ignition power should be connected from the harness side of the coil/ballast (power going in) There already should be an ignition power feed suitable for the carb as the Mikuni needed it for the fuel cut solenoid (it will/should be a female bullet connector black+white stripe unless the PO lopped it off ) No random wires hanging off that side of the harness? And that wiper socket looks nasty - water got into it or something...