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Hi Earl, I've had problems with the aftermarket blower regulators. Have you already tried a second new regulator? If you haven't I would do that first. It sounds like you just got a defective blower regulator.
I did read your question but it was not clear to me that you replaced the regulator twice. Turn the key on and turn the blower control to high and see if you have voltage on the white/pink wire. Let me know what you have.
Are you saying that the old motor works when plugged into the new regulator but the new motor will not?
Ok, unless the wiring is incorrect the problem is with the regulators. Order a Behr brand regulator and you should be fine. If you want to send me a picture of how everything is connected I'll take a look at it.
Hi Earl, I'm just following up with you on the Mercedes. Did you get this figured out yet? Have you ordered another regulator?
Glad you got it squared away. Obviously the problem was with the regulator or the wiring.
Very possibly. I was referring to the wiring between the regulator and the blower motor not the wiring to the regulator from the car. Glad you got it sorted out. If you would please take a moment to rate my service on this question I would appreciate it. If you do not rate my service I do not get paid for helping you.