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Do you already have the relays in place? Run the hot for the control side (of the relay) through the toggle switch to the thermal switch then to the relay. The thermal switch has only two terminals hot in and hot out (when the switch is activated by heat). There are different types of switches, some go in the radiator fins and others go in the coolant line. I prefer the coolant line type, I had a bad experience sticking things through raditaor fins before!!



Thanks, This does make sense to me. Doing it this way i don't need a on/off/on toggle do I? The relay won't turn on until a certain temperature. Relays are all in place, everything works off of toggles, just trying to eliminate one more thing to think about. And I will find a place somewhere to put the sensor other than the radiator probe type.