1966 foglight wiring question

Hello. Ford's diagram, while, strictly speaking, is accurate, is also very easy to mis-interpret. What it's telling you to do is splice into the main power feed that comes from the hot side of the starter solenoid and brings power in to the headlight switch, fuse box and ignition switch. It also doesn't really give the impression that you are unplugging the taillight feed and interrupting it with the foglight switch, which is exactly what you are doing.

Splicing into the main power feed was not one of those Better Ideas from Ford. :gringreen Their objective was to have the car run safely and reliably throughout the warranty period. Then, they would prefer that you buy a new car. Splicing into that wire would be the beginning of the end for that wire, because you, by splicing into it, you are effectively turning it into a smaller wire at the point of splice and, consequently, the resistance to the current that the foglights, and everything else inside the car, draws will increase some, and the wire will corrode much more quickly at the point of splice, meaning that you would have all sorts of electrical issues waiting for you down the road.

How you want to run this wiring is very simple, and can be very easily done. Anyway that you go, you will need to make the wire that goes from the circuit breaker to the power source. Just attach the circuit breaker to the pedal bracket, like Ford did, and make the wire with a ring connector on each end. Attach one end to the circuit breaker and the other to the threaded stud on the back of the ignition switch. This way, the main power feed remains unmolested, and everything works just like it's supposed to except for how it will be better in one respect. Ford's setup had the foglights able to work all of the time, as in, it was possible to drive somewhere with the foglights on, forget to turn them off, and, when you come back to your car, your battery is dead. If you get the power from the back of the ignition switch, it isn't possible to forget about them and leave them on, unless you arrive, shut the car off, turn the key back to on position, and then walk away from the car with the key still in the ignition switch and in the on position..

Hi again. Actually, that's one of the things that make that diagram easy to mis-interpret. The female bullet connector shown in the foglight diagram is not the same female bullet connector shown in the headlight circuit, and to make it even more fun, they are both on a black wire. The bullet connector on the headlight plug is for the front turn signal/ parking light assembly. The foglight wire harness is a separate, free-standing system with that bullet connector having the chassis ground wire for the fog light plugged into it, which, just for extra fun, they both attach with the same screw on the radiator core support. The foglights pulled power from the tail light circuit when the headlights where on, and from a splice into the main power feed when the headlights where off from the factory.

But, to answer the question, :gringreen , if your car does not have the three prong connector, but now has back-up lights, someone has wired the back-up lights some way other than how the factory did it, and they will not be affected by your adding foglights. Just plug your wiring up color-to-color as if you had the three prong connectors in your car. The black wire with the red stripe which is for the back-up lights is not the wire in the middle of the connector. Just plug the connectors that you have into the foglight wiring, making sure that the black wire with the red stripe prongs aren't plugged into anything. Also make sure that you don't get things flipped around so that the yellow wire is plugged into anything other than another yellow wire, and you should be fine. I'll dig out some stuff and take some pictures which should help. It would vertainly be easier to just go ahead and get the 65 foglight stuff, but, last time I checked, that stuff wasn't free, so, if you don't want to go that way, you can very easily make what you have work just exactlylike you want it to.