2007 Columbia front blower motor not working

Orange- battery voltage. Black- ground Two control wires, blue with same color strip? One goes from the fan switch to the circuit board on blower motor. It should read about 0-6 V depending on switch setting. The other sends a signal back the the switch module and should read about 1/2 of the first one. If the module does not like the signal it receives in return it can discontinue power to ask the motor to run. Just my experience and off the top of my head. They are kind of sporty but easy to swap if you have another truck.
Last time I asked the dealer if they had one was told they had 17 on the shelf. That could be a sign.

 

While plugged up yes. If you can't get to the plug installed get the motor out on the floor. Might want be easier with two people. If you turn it on and walk around to check the switch module may have discontinued power before you get there to test it.

 

May have to have the key off for a while to reset before testing.

 

Get a new one 125 bucks t6 hex screw 10 years oid freightliners were not built to last just changed mine I guess mine was kind of newer no resistor it was built in it blower just went out out of blue but those two fuses at bottom of dash that look like spares are not they control blower so look at them first

 

Try shaking that harness end around some first. I have seen those bad before and cause intermittent on/off.