Ok, my original A/C unit was replaced by the PO with the newer R134a system to update the car and make it cheaper to charge. I have a leak, somewhere, so there is no pressure building in the system to turn the A/C compressor on. But when you bypass it there is still no power. Is there a switch or a relay that takes care of that? If I could get an electrical diagram for an 85' W126 300SD that would be great too. Shot in the dark I know but I thought I'd put it out there.

I've done some research and there seems to be alot of people with similar problems (no power to the compressor) but I never was able to find a definite solution. WHAT IS GOING ON HERE???

Thanks everyone, without you all I'd be on the side of the road.

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1963 Ford F100 - Cummins Swap?
1985 Mercedes 300SD - 210K
1992 Ford Festiva - 92K
2001 Ninja 250 - 8K