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#1
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Testing blower regulator w124
I have removed the fan and regulator and determined by my lack of voltage on the three pins behind the brake booster that I need an ignition switch. I'd like to put the fan and regulator back together with the wiper but do not know how to bench test the fan regulator. I tried putting twelve volts to the red wire and ground to the black wire and the fan does not work. Is this a way of testing the regulator? I also tried 12 volts to the yellow wire and ground black and the fan didn't work. The fan does work if I apply voltage to it directly. Any help would be greatly appreciated!
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#2
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You need the red power and black ground hooked up then the yellow is the signal wire, which should only be 6 or 8 volts (I don't recall exactly at the moment) for max blower speed. I'm not sure 12V on the yellow was a good idea but the regulators are relatively robust so you're probably OK.
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#3
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Wow, a pm and a response already!!! Thanks for the info. My regulator is ok and I can at least put the fan, regulator and wiper back together so I can remove the tarp from the front of the car. Now onto the ignition switch.....
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