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Communication problem. Check the wiring between the Main Control Board and the Speed Control Board. Wiring bad, correct wiring problem. Wiring good, replace the Main Control Board. If the problem is not corrected, replace the Speed Control Board. Here is the part you need.
I checked some old diagrams for that and though they show just about everything else, the a/c part is vague...If I remember correctly, I believe the compressor gets powered through the heater control switch, to the heater relay, then to a thermal limiter switch (a small black item with two male spade connectors protruding from it.) then that side goes to the clutch terminal. The other clutch terminal is ground. Since a/c was not a "fixed" option back then, likely there is a separate diagram for that option. Hope you find a diagram, but I believe I have it right. or, darn close to it! The only ting I can't remember is where the heater relay draws power from (likely a fusable link connected to the starter battery terminal)
jonj1138: BINGO! I believe you have probably hit on the correct source of the problem. Who ever installed the radio, probably looked for the wire which supplied power when the lights were on which should be the red wire with the blue tracer. They have somehow tied the unswitched circuit into the lighting circuit. They may have even picked off of the the cigarette lighter.Then they tied it into an Unswitched power source, not thinking of the feedback. Unswitched power sources: a red with a white tracer and a red with a black tracer. I believe I have the correct colors It's been years since I have worked in a ZX ans I don't have a SCHEMATIC handy. I am doing this from memory. There may be two wire connected to the Unswitched power supply. From your stereo, you will have a Yellow wire. This is the Memory wire. Leave it hooked up to the Unswitched power supply. The other wire needs to be disconnected and if it was hooked up to light the for the radio, hook it up to the red with blue tracer. That will be the switched circuit for the lighting.
I hope that this will solve your problem. Good Luck!
The wire from your brake controller should be blue (if it was wired correctly). It also should be a heavier gauge wire. Typically 10 gauge. Once you have determined the correct wire, check it to see if controller power is getting through the plug. Another common problem is the ground wire not connected (white).