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Dwain, I normally use the fan wires for the relay. #151 would be ignition power to the relay. You can use 157 for the override switch. Remove #161 from the switch and replace with a ground. #157 would then run to the sending unit for the fan. All you are doing is grounding the sender when the switch is on. For the heater you can use the heater wire #127 which is in a 6 wire plug coming from the fuse block which is normally not used.
Don
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