1983 300cd A/C compressor not engaging

Hello all, I have an 1983 mercedes 300cd. The a/c compressor clutch is
not engaging. I have tried all the things I know. It is not the
pressure switch, I put 12 volts to the compessor side of the switch
and the clutch engages, all blower controls work normally. I am
getting no power from the blue wire that goes from a metal box behind
the glove box to the pressure switch.
Any ideas on what can be the problem.

I also soldered the bad terminals on the climate control board (didn't
help).

Thank you in advance, Kevin