I am currently installing a universal wiring harness in my 66 f100 2wd. Must of the directions have been good, but on the ignition switch the colors havn't matched up to what the directions say. Can anyone help with decoding the wires going into the stock ford plug. The only one they got right for my truck was ignition switch power is yellow.
thanks

 

I have a 64 so it may not apply to well. The rest of the wires coming off the switch should be; S terminal: blue/red = starter silenoid, Center post: black/green = accessories circuit & constant voltage regulator on the back of the dash, blue/white = cigarette lighter, green/orange = heater blower, C terminal: red/green with a green connector = coil power, red/brown = idiot light power, B terminal: yellow = constant hot The red wire can be A terminal, red = temp indicator light relay or C terminal, the "I" for the altenator regulator IF a green/red wire jumpers in before a 2 prong pigtail. Hopefully that isn't too far off or I haven't confused you.

 

thanks for the info