2000 pete a/c compressor will not come on

The title says it all. Bought the truck ac didn’t work worth a crap. Got home put alittle Freon in it drove it around the block cooled fine. Next day got in it ac wasn’t good at all. Two weeks ago. So today put the nitrogen to it to find my leak no leaks vacuumed all the Freon and nitrogen out. Pulled office tube it was gunned up cleaned it slapped it back in vacuumed again put two cans in it clutch would never engage on compressor. Has 12 volts to compressor + and - wire are run to this compressor instead of just +. Pulled ac breaker compressor relay and all kind of other stuff trying to stop power to clutch. Only way to kill power to clutch is turn ignition off. Does peterbilt switch the ground on and off as the switch and just send power to the compressor and use the ground through hi and lo switch or what, how does it work with Pete’s? The compressor worked this morning on thing that has changed is vacuuming down system and adding 24oz of Freon 100psi on low and hi side guage compressor won’t kick on can turn by hand. Like I said worked this morning was short cycling on and off for 20 seconds of how ever long it took me to climb in truck get out walk around see it was short cycling and turn it back off. Fan was staying so I figured I had too much in it from the otherday I just wanted to see if it would cool.

 

It’s weird compressor was cycling on and off because of too much Freon evacuated Freon now it won’t come back on at all

 

Either way has enough psi to push low pressure switch in correct? Which should make the compressor clutch atleast pull in.

 

That’s my exact point I have power to the ####### and it won’t engage. bought new compressor today same thing clutch won’t engage it’s got 12.4 volts there but won’t pull clutch in. And I was trying to find power source in fuse panel so I could understand where the power to the compressor is coming from it’s like it’s having the ground switched on and off instead of sending power to the compressor and turning it on and off.

 

Well finally figured it wore 570 right out the firewall was broke off inside the duestch connector put a jumper in clutch locked right up with no issue soon as I jumped out the low pressure switch since it doesn’t have any Freon in it

 

Oh and to clear the confusion that’s why I was trying to figure why I had power at the compressor wall the time to see if they were using a ground as a switch my 96 model truck is like this truck except it has a one wire ac compressor clutch on which is wire alittle different it’s all good though I got it fixed