I have it tested and while truck running on ON and OFF position I have 0 reading.When only ignition ON in OFF position it read 30 ohms and when switch is On it read 0.
While no engine on and with ignition off It read around 60 ohms in booth positions.
Little background,I did frame of restoration on this truck.Before disassembly it was all working.When I put it together IOD fuse was blown because I shorted mirror wires.I didnt recognize it.I was chasing wires ,testing it and while testing ac wires I did hear something in PCM hapened,lik short(like when you touch positive and negative wires). After
I found short on mirror and replaced IOD fuse everything work except AC.I did test compressor by applying 12 v and it is working. If I touch Wire coming out of PCM with light probe compressor start working.Thanks for your time and help, Dmitar.This name explain my English.