Car is a 86 4 cyl, v5 compressor.
Starting with a little history, the PO at one point in time removed the compressor and the compressor brackets ;( . I found the AC power relay on the LH side of the engine bay had been removed and a hair pin had been used to jump power to the dark green compressor power wire. The compressor power and both high and low pressure connections had all been melted due to excess heat or laying too close to the exhaust. I replaced all connections and wired them to what I thought was the correct locations (both high/low connections had green and white/red strip wires). Also replace the ac power relay.
I bought a new V5 compressor, found the brackets, bought a new engine compartment connection hose, flushed the system, replaced all o-rings for r134a conversion. I hooked up a set of manifold gauges and pulled a vacuum for about 45 minutes. After letting the system set for a few hours to confirm vacuum was holding I proceeded to fill the system. After adding a 12 oz can of r134 I noticed the low side pressure rising to 60 psi, high side was around 50 and my compressor wasn't kicking on. To confirm my readings I rented a second manifold gauge from autozone. As I started to add a second 12 oz can, the low pressure was steadily climbing but the ac compressor was still not activating the clutch. While I'm not the foremost expert on auto ac, I believe a fully empty fiero ac system should hold around 32 oz of r134a. This leads me to believe that the compressor should a least attempt to kick on with 18 oz of coolant correct? At least I thought the low side pressure would be high enough to activate the clutch coil ( 65 psi at 80F outside temp).
To confirm the compressor was at least working, I borrowed the PO method and removed the AC relay and jumped the power. The ac clutch kicked in and pulled the low side pressures down to 30, high side stayed around 55-60. I kept the compressor running until I emptied the second can. I have cool air blowing through the vents. However, as the can emptied the low side pressure was rising slowly back up to 50 psi (high side still only at 55-60). Now I believe I still need to add at least 10 oz of r134a from many of the articles I read. I've also learned that my low side pressures should be lower and my high sides higher. Complicated with the fact that I believe I"m by-passing the high/low switches on the back of the compressor but jumping the ac relay power, I'm hesitant to add more until I can get the compressor to run on it's own.
So I guess my question is how should I go about testing to see if the high/low switches are working, and if the ECM is reading it? Should I finish filling the system to recommended capacity and then recheck pressures? What pressures are needed to activate the compressor? Where do the LT blue/blue wires at the ac relay go? Why cannot the weather be 75 degrees year round