2007 9200i ac issues

[race7820000]

I have a 2007 9200i day cab that the air conditioning quit working .

It stopped last week and I checked pressures which were fine. Pressed a.c. button with key on and couldn't hear the clutch engage so I put a test light on wire that goes into compresser and it had no power.

Swapped relays which I found 2 that are associated with the ac and nothing. Pressed the breaker fuse and it clicked and the ac started working again!!!

Next day it stopped again, pressing the fuse did nothing, swapping relays did nothing. I foind the fan switch on the system but i cant find the low or high pressure switch .

I'm assuming something got hot and tripped the fuse. I looked everywhere I could and tore apart dash and looked at what I could yo try and find a short.

It still doesn't have power going to compresser. When u press the ac button on dash both the relays click but that's it.

If you run power to the compresser from the battery it works and cools like it should.

I'm lost. Any ideas?