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Originally Posted by Arthur Dalton
Power at the red wire simply means you have 12v feed from the fuse box.
The regulator is in the ground line for the blower [ switched ground] and it is triggered by a variable voltage from the yellow wire coming from the PB unit.
Look for 2-8 volts at the yellow wire with the PB unit ON. If you have that, then the reg is not tripping.
In that case , the blue wire coming from the neg side of the blower motor
to the regulator can be jumpered to ground. If the motor then works , you have a bad regulator.
Just make sure you have trigger volts at the yellow before diagnosing the reg. as bad....
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Arthur,
I did my test on our W124 500E since I have NO blower movement, and here are my results:
On the 3-pole connector, I have +12VDC on red; good continuity to ground; and 7+ VDC on the yellow control wire on HIGH & Defrost, about +2VDC on "low" speed.
How can I bypass the regulator and access the blower motor directly to see if the blower still spins/works ? In other words, is there an accessible blower power connector that I can access to add 12VDC ?
TIA,
:-) neil