HELP! Low Pressure Switch has No Power!
 

I have a 1996 Chevy C1500, 2WD, 5.7, 350, V8/Vortec
('97 Rebuilt Engine - same)

I have replaced my Compressor (bought a new Delphi), orifice tube, drier, AC Control Unit, and Ac Relay. Flushed out the system (it was pretty disgusting I have to admit!!) and added Freon. The system pressure is adequate. I've had to put a mechanics switch in where the AC Relay goes for now - in order to make it work. I DO understand the Compressor will not be cycling on and off - so am not using the AC much at all..... What I DID DO - I looked at the green wire in the low pressure switch. From what I understand from the Chilton, it goes to the AC Control Unit. I looked at the back of my control unit and sure enough the dark green wire (which is partly brown like it's been burned) doesn't have any voltage either. Anyone have any ideas? Any what so ever? I'm trying my best to understand the electrical wiring in my truck, but this is not what I'm use to. I'm use to fixing mechanical parts on my truck - not electrical. Thank You!! ;)

Ps. I tried jumping the low pressure switch, and it made my compressor stop completely.