Heater box wiring

[Cam1399]

I have a 74 duster. Heat. It does not have air. What are these 3 pins on the heater box?

 

[4spdragtop]

That is a resistor for blower speed.
Remove 2 screws there may be a part# on it.

 

[Cam1399]

Okay makes sense. I’m guessing wires should be coming from the controls?

 

[4spdragtop]

From heater switch i believe. Onto mymopar.com and download factory manuals, they're free.

 

[Cam1399]

Good deal. Thanks

 

[townsend]

Those resistor terminals are the same for 1973 and 1974 Abodies.
Go to the 1973 Dodge chassis service manual and look on page 8-170, then diagram CI-33.
The green wire in your photo probably goes to the single terminal on the right.

 

[Cam1399]

Perfect. Thank you. Going to need a heater core and I’m trying to save the fan motor

 

[Cam1399]

Does anyone know which wire is hot going into the heater switch? It is a 3 prong wire. I have a red/white wire that is hot whether the switch is on or off. It ties into the heater switch and runs back to the resistor. Is this correct?

 

[Cam1399]

I figured it out. There was another plug I was using that was the same shape plug