I used the battery out of my Buggy because it was easy to move under the car. With the Benz running and AC switched on I tried to jump pos and neg terminals from the battery to the connector on the compressor. NOTHING.

I then checked for voltage at the lead that connects to the compressor. NOTHING.

I checked line pressure at the low side and was getting decent pressure.

What to do next? Can you check the AC relay in the fuse box? I was going to try and swap out a ACC pushbutton unit but I don't want to spend the money if I don't have to.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R