Re: Electric Fan Wiring
A single prong temp switch is designed to ground the relay coils. Your switched power wire should go to the positive side of the relay coils. Make sure nothing else is connected to the positive side of the coils. Take a wire that is grounded to the engine or chassis and connect it to one prong on your temp switch and a wire from the other prong on the temp switch to the negative side of the relay coils. Hooked up this way the fans should run when you jumper the prongs on the temp switch and turn on the ignition.
69 RS 355 Tremec 5-Speed 4.11's