wiring info
Most aftermarket wiring harnesses use GM Colors, I used to say the GM electrical engineers grew up with only an 8 crayon color box. They reuse the same colors in different wire sizes, (I was an engineer at Ford, had interior trim and Electrical systems for a while) The easiest thing to do is use a Ford starter relay, they were mounted normally on the inner fender panel between the battery and starter, You will need the early design with 2 small terminals, from any ford product from 57 thru the 60's, one of the small terminals hooks up to the start terminal on the ignition switch. the other terminal hooks up to the + terminal of the coil. The wire from the Run terminal on the ignition switch needs a balast resistor or correct resistance wire.BETWEEN the switch and the coil , Ford use Pink for that wire and it had High Temp rubber insulation, If the factory wire is reused ( we tried to reuse everything we could when we were broke kids trying to build a car with lawn mowing money,) the factory wire should be the original length, don't shorten it or fold it over in your harness, that can cause hot spots, burning up the wiring. I prefer the ceramic balast resistor ford started using on the 56's, It does generaate heat, should be mounted on metal away from other components, When you turn the key to the run position current flows thru the resistor , giving about 9 V power. when you turn the key to the start position, the relay sends power thru the large cables to the starter, and battery voltage thru the second small terminal to the coil. The high starting load drops available voltage but the secong wire to the coil has enough voltage to get a good spark. DO a search here on HR , Ford starter relay and you will get illustrations more info.
