'80 300TD AC Wiring

[JimmyL]

First of all, I'm an idiot. With that out of the way...
I bought this car from a scumbag as it turns out, and have had numerous issues. The latest has to do with the wiring for the AC. The ACC is disconnected, and the compressor and fan motor are hardwired to 2 toggle switches below steering wheel. (It came that way) Well, The AC compressor has a connector with 2 wires, brown for ground (melted now), and blue/green. A wire was piggybacked to the blue/green wire which went to toggle that turns on compressor. The wire kept coming out, so I decided to clean up the wiring alittle tonight. Well, I connected piggyback wire to brown wire (oily, my mistake) and melted the brown ground wire all the way up the harness to the frame behind instrument cluster. This story is too long, so a simple question. The blue green wire goes from compressor to pressure switch, then to temperature switch (per Haynes). Where is said pressure switch and temperature switch? I assume I will go from compressor to pressure switch, then to toggle. Other side of toggle will go to 12vdc. Right???? I was going to attach a picture but camera batteries were dead. Will post pic tomorrow if it will help.
Thank you,

Jimmy

[JimmyL]

I wasn't thinking clearly in my earlier observations and questions. I found the wire from the compressor clutch connector to where it connects to the pressure switch on the dryer, and then it dawned on me. In this configuration it doesn't matter where that is going. The hot from the battery via the toggle switch is bypassing the pressure switch and any and other component in that circuit. That raised another question. What are the dangers of just a hotwire to the compressor clutch? Is the pressure switch what doesn't allow the compressor to come on when you're low on freon? When removing my ACC unit, I noticed that the passenger side plug was disconnected. What does that connector operate. I'm sorry for the questions, but Haynes book just isn't much help, and I guess that's what this forum is for anyway.
Thanks,
Jimmy

[leathermang]

No need to apologize when you were just talking to yourself.... LOL
That pressure switch on your Reciever/Dryer should be both low pressure cutout and high pressure turnon ....
Your system is a Cycling Clutch.... if it is straight wired it can't turn off.... very dangerous for your ac system. There are several items and conditions which control the compressor clutch... all need to be in place and working properly to provide cold air and avoid big expenses.