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Old November 12th, 2013, 09:57 PM   #1
Wramblerguy
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Default Yj blower motor problems

Ok so the blower motor stopped working in my jeep
I figured out that the motor was getting power with a test light
I replaced the blower motor with the 72 blazer or w/e upgraded motor
Grounded it to the body of the motor
Get it back together and still nothing
The plug before the motor still has power
The plug has over 12 volts in all speeds of the switch though
I would think the voltage should be lower for slower speeds
My next step is going to be running jumpers from the battery directly to the motor to see if it works and if it does idk what to do next
I was hoping someone else has had the same issue or could help with some suggestions
Thanks
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Old November 12th, 2013, 10:26 PM   #2
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I think the blower resistor grounds the motor to turn it on and off

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Old November 12th, 2013, 10:27 PM   #3
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I think the blower resistor grounds the motor to turn it on and off

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It's a 2 wire plug and using the multi meter on the two prongs I still got 12+ volts
Could it still be the resistor
It just can't support a load?
I'm not the best with electronics
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Old November 12th, 2013, 10:30 PM   #4
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Yea it sounds like the resistor is bad i dont think they r very expensive so i would try that first

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Old November 12th, 2013, 10:30 PM   #5
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Ground the case of the motor to the battery with a jumper wire
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Old November 12th, 2013, 11:10 PM   #6
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Ground the case of the motor to the battery with a jumper wire
I could do that but how did it ground before?
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Old November 12th, 2013, 11:13 PM   #7
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Yea it sounds like the resistor is bad i dont think they r very expensive so i would try that first

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Ya the resistor is like $6 and easy to change
I'll look into that
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Old November 19th, 2013, 09:14 PM   #8
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New resistor didn't do it
Ground on the motor works
I can jump the wires and get the motor to work
I figured it was the speed switch so I removed that but I can't jump the terminals to get it to work
So it's not either of the switches
Idk what I'm missing here
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Old November 22nd, 2013, 10:21 PM   #9
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The power was weak so I just ran a new wire to it
It's just hot all the time so I have to turn the heat off when I turn the jeep off
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Old November 22nd, 2013, 10:35 PM   #10
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Originally Posted by Wramblerguy View Post
The power was weak so I just ran a new wire to it
It's just hot all the time so I have to turn the heat off when I turn the jeep off
Wire it to key on power

And use a relay.
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Old November 22nd, 2013, 10:39 PM   #11
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Did you check the relay?
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Old November 22nd, 2013, 10:42 PM   #12
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Did you check the relay?
I got tired of messing with it and tied of looking at wiring diagrams
I don't even know which relay it is
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Old November 22nd, 2013, 10:48 PM   #13
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I'm going to guess you have a bad relay. It should be under pass. side of dash.
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Old November 22nd, 2013, 11:07 PM   #14
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I'm going to guess you have a bad relay. It should be under pass. side of dash.
Is that the only relay that is floating around under the dash?
I always wondered what that was for
Thanks
I'll check that out
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Old November 29th, 2013, 05:35 PM   #15
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Ground is controlled by the heater control head
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Old November 29th, 2013, 10:49 PM   #16
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Ground is controlled by the heater control head
Ground of what?
The ground on the plug that plugs into the motor worked
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Old November 30th, 2013, 05:36 PM   #17
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The blower is fed power from the fuse box to blower motor and the controller is the ground side
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Old December 1st, 2013, 10:36 AM   #18
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The blower is fed power from the fuse box to blower motor and the controller is the ground side
Mine isn't
The power goes through both switches before it gets to the motor
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