Hello smjbrules. Based on the wiring diagram, you should have a blue wire going from the heater relay, down to the TH3 Thermostat cut off. Then a black wire goes from the TH3 Thermostat to the TH2 Thermostat high limit. From the high limit it goes to the heater. Then the heater has a red wire that goes to the motor. This makes up the heating circuit. Hope this helps.
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