I think I would start by figuring out if the compressor is getting power to the clutch and if not why not. 60 psi is probably enough to keep from tripping any low pressure safety switch so what is keeping it from pulling in the clutch? Is it the CCU or a relay or what?

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1983 300SD
200000miles

I have that chart but the forum wont let me load it
I think its in vstech long a/c thread