TM 9-2320-361-20 page FP-1 wiring diagram shows two wires on the heater fan motor. It doesn't give colors but shows one used as a quote ( ground lead to chassis body or engine, bolted connection)
Hope this helps.
Why would you use the TM 9-2320-361-20 Deuce wiring diagram on a CUCV?
The correct manual is the TM 9-2320-289-20 or the TM 9-2320-289-34. The diagram for the heater is in the appendix F-20 or the E-20.
The heater circuit uses the top fuse. The brown wire feeds the heater switch and three wires go to the blower motor resistor. High is orange, medium is light blue and low is yellow. From the resistor, an oragne wire feeds the correct voltage to the blower.
There is a capasitor/suppressor in the feed wire. It takes out the noise for the Military radios. They have been known to go bad.
The blower itself is grounded thru the housing.
Looking at your picture, it looks like the orange wire 2-ORN-52A has broken between the blower switch and the resistor. You will need to find the other end.
Also I am confused. You say you have power at the fan but it doesn't run, but you also say when you hooked the orange wire up the fan ran. Please clarify
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