How do you test the blower motor on a 2001 Dodge Dakota?

This is not one to easily answer. You have to rule out a couple of things before you can say it is the blower motor. These include: Fuses, Wiring(looses connectors), blower motor resistor, blower motor relay, blower motor switch, bad heater\ac mode control switch(the part that you adjust on the dash.

The last unit is almost never the case. It also over 100 bucks to replce. I would check these first before assuming bad motor Check the blower motor resistor, (the harness/connection near the fan) they appear to be prone to burning out.

If all those resistance readings are correct, or you just love troubleshooting, you can do the following two steps by disconnecting the blower motor plug. Disconnect the blower motor plug (seen disconnected in the following picture, for this step you want the plug indicated by the blue arrow) and connect a wire between pin 2 and ground, then between pin 1 and a 12v source (fuse block, battery, etc…). This will verify the blower motor functions correctly.

Notice in the picture the plug is held up by two friction tabs, you can pull down and release those tabs for easier access. Using the following diagrams, and with the blower motor plug disconnected, connect one lead of your meter to pin 1 of the vehicle side of the plug (Red arrow), then the other meter lead to a suitable ground. Verify the resistor block is plugged in to the vehicle harness.

Rotate the fan speed selector switch through all the positions and watch the resistance change on the meter (should be similar readings as above).

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