Are you getting 12 volts at the compressor clutch?

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1990 300d 2.5 new to me.

i couldnt find my meter, I found it later but it was already dark. I will check at the pressure switch tomorrow, then if it has 12v I will check at the clutch. If the pressure switch does not have 12v, whats upstream from that?

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)