Blower Motor Quit working 1974 dodge d100
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Blower Motor Quit working 1974 dodge d100
In my 1974 dodge d100 I went out a couple days ago to start it I went to turn on the blower motor and nothing happened, I tried cleaning connections to everything, lubing the blower motor itself, ive even done a continuity test to all the wiring and its all making contact and its getting power to the 2 black and red wires on low and high it has 12 volts when i turn the switch on. Im stumped currently and before I go out and by a new blower motor I just wanted to see if anyone else has any ideas. Is there a way that I can force the blower motor to come on? like with a separate battery or something like if i use my 50cc scooter battery is there a way I could force the blower motor to come on just to see if it works? I have the shop manual for the truck and I can't tell what is the main power wire going to the blower motor from the switch and resistor. My truck is also the no a/c one so makes the wiring a bit less complicated. Any tips and ideas would help a lot because i miss driving it and I don't want to right now because no heat. Also with it I did a bit more testing and I don't know how the resistor is supposed to handle the power but when I plug in the 2 red and black cables into the resistor my multimeter shows it has 12 volts at the plug but when I plug into the resistor the resistor show 0 volts is flowing through it. So Could it be a bad resistor? I am just so confused, Because I don't think electric motors like that just stop working because it was working when I parked the thing a couple months ago. I dont drive it in the winter much as it doesnt have A/C to defrost the windows.
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Joined: Jul 2013
Posts: 337
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From: TN
Blower motor should be a 2 wire. Don't know if you can get to the connector without pulling the blower. Usually motor will have red and black wire. You can put 12v directly to the motor to test it. Resister testing with a voltmeter set to ohms.
Grand Champion
Joined: May 2019
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From: S.W. Indiana
In my 1974 dodge d100 I went out a couple days ago to start it I went to turn on the blower motor and nothing happened, I tried cleaning connections to everything, lubing the blower motor itself, ive even done a continuity test to all the wiring and its all making contact and its getting power to the 2 black and red wires on low and high it has 12 volts when i turn the switch on. Im stumped currently and before I go out and by a new blower motor I just wanted to see if anyone else has any ideas. Is there a way that I can force the blower motor to come on? like with a separate battery or something like if i use my 50cc scooter battery is there a way I could force the blower motor to come on just to see if it works? I have the shop manual for the truck and I can't tell what is the main power wire going to the blower motor from the switch and resistor. My truck is also the no a/c one so makes the wiring a bit less complicated. Any tips and ideas would help a lot because i miss driving it and I don't want to right now because no heat. Also with it I did a bit more testing and I don't know how the resistor is supposed to handle the power but when I plug in the 2 red and black cables into the resistor my multimeter shows it has 12 volts at the plug but when I plug into the resistor the resistor show 0 volts is flowing through it. So Could it be a bad resistor? I am just so confused, Because I don't think electric motors like that just stop working because it was working when I parked the thing a couple months ago. I dont drive it in the winter much as it doesnt have A/C to defrost the windows.
Your resistor block has failed. Replace it and the blower should work. You can wire to to be on or off but I prefer to fix things right. When the resistor block fails, you either have high speed only or no fan at all. If it's high only, it's failing and will be no fan.
