I've been trying to run down a problem with my A/C. Fan works, all fuses good.

I've checked voltage at the compressor and it reads about 8 vdc. It does not change when the climate control is cycled on and off.

Does anyone know (or is in a position to check) the voltage that should be going to the compressor?

Thanks,
Robert

 

Manual says :
How could it be anything BUT the full 12 volts ?

 

Well, this is german engineering at work I know there are other devices that have a "trigger" voltage sent by a control module, etc.

I agree it should be 12 volts. I guess my concern was that it was 8-ish volts and constant with no change when cycled.

Per the manual, where is the C106 connector. I'm assuming it's not the one at the compressor as that one is pretty hard to get to...
Is that the K40?

THanks,
Robert

 

Here is an idea, it may not be low voltage:

Connect your meter's negative lead to the battery's negative post. Now, measure the voltage at the connector and THEN measure the frame/ground of the compressor - it should be near zero volts. If it is 4 volts or so, there is your missing voltage - fix your ground!

In any event, the voltage should change when you turn the A/C on and off.

 

C106 is on the RCM ( K40 ) :

Edit : SCRATCH THAT ! IT'S NOT ON THE K40, IT'S AT THE FRONT OF THE MODULE BOX.

 

Tankoo tankoo

You are a prince among men...

 

Thank you kind sir. We are so close, we gotta meet one of these days .....