The power for OEM coils is via a ballast resistor. The primary impedence for the stock coils is 2.5 Ohms and the inline ballast resistor adds 1.5 Ohms. Power comes from the MAIN fuse via a heavy white wire; probably 14 ga. to the ignition switch. When the ignition switch is turned to the ON position, power comes out the switch on a wire (can't recall which color) through a large white connector and goes to the right hand switch gear to the kill switch. Out of the kill switch, two wires come out. One loops to the starter button and the other voltage out is a yellow/red wire. This wire comes back via the big connector that connects it back into the main harness. The yellow/red goes into a ballast resistor bolted to the battery box on the left side. This thing is a white ceramic block looking deal. The yellow/red comes out of the ballast resistor and goes back through the main harness where it comes out above the valve cover in a dual out connector. From here, two red or pink wires plug into the dual out connector and go into a Y where one of the two legs connects to a connector lug on the OEM coil in the front of the coil. The other coil connection (the other lug) is the "ground" or signal from the pickup coils via the igniter box. Out of the igniter box is a major connector. This connector has a number of wires but one is black and one is green. The GREEN wire is the wire that comes from the RIGHT pickup coil... the 2/3 pickup coil and should be connected to the right hand ignition coil. The BLACK wire should be connected to the left coil which becomes the 1/4 coil. These wires connect to the other lug on the front of each coil that isn't connected to the power. It doesn't matter which wire goes to which lug.
wiredgeorge Motorcycle Carburetors
Mico TX
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