Burned wires

[plootsa]

Hello
Can anyone tell me why all 4 wires going to the a/c low pressure switch would melt all the insulation off going to the harnes connector and not any further,this is the dash a/c and of course the air does not work anymore.
08 Berkshire

[turbopuppy]

apparently you had a short. The insulation burned until the circuit opened - fuse blown, breaker tripped or conductor broke.

[Bama Rambler]

I'd suggest getting a service manual for the vehicle chassis on that unit. The A/C low pressure switch either feeds a relay or the clutch directly. In either case I agree that you have a short in either the relay or clutch. It is also possible that the wiring between the switch and relay/clutch shorted.