W124 Blower Regulator Question

[tygger]

How do I know if my blower regulator is the culprit for my blower motor not working?

I measured the voltage at that goes into the blower motor and I get 12.xx volts. So I'm getting power to the motor, but the motor doesnt work. Does that only mean that the blower is broken?

Or could the regulator also be broken even though I'm getting power???

Thanks

[Arthur Dalton]

If you have power across the motor, then the motor is bad [ or bound up-see if you can hand spin it]
If you are getting power to the red wire of blower and using ground for your other lead, then jumper a wire form the blu wire to ground. If the motor then runs , the reg is not working. [ or you have no voltage to reg.]
Try that and repost.

[tygger]

Ok... will have to try your suggestions. What I did to test voltage was by measuring from the red and blue wires that go into the motor. Does this mean the motor is bad? Should I have used a different ground other than the blue wire to test???

I did try spinning it and it was stuck. After I freed it up and oiled it... I connected everything and it still doesn't work. It still spins, but with friction.

Thanks

[Arthur Dalton]

Motor should spin with 12 to the motor terminals.
Try a jumper wire from the blu to a good ground..that takes the reg out of the circuit and will gve the motor a true ground....make sure the key is ON so you have pos power to the red at motor.. this is basically the same as direct battery voltage to the motor, by-passing any controls.
If you have power and it still will not start, give it a spin by hand while the power is applied. Your idea of friction may be very different than mine..the fan should free-wheel when you spin it bt hand.

[tygger]

When I spin it by hand, it doesn't continue to spin when I stop. As soon as I release contact, the wheel stops.

Thanks for suggestions. I'll try them...