Hello Fellow Brick Owners!

I have ran into a issue that I know you all will probably have diagnosed in minutes. I have a 1986 Volvo 240 Sedan. The A/C will blow what I consider cool air, but definitely not cold. Upon popping the hood, I realized the A/C clutch was not engaging. Since the car has been converting to R-134a about 10 years ago, I dumped about 6 ounces of refrigerant into the compressor to see if it would start the clutch. I didn't want to put anymore than that because I was unsure of how much was actually in there. No luck. However, upon crawling under the car I noticed a green wire with an exposed area sitting next to the compressor. It was still intact, but severely exposed. My question is this, will this exposure cause the clutch to not engage? I am repairing that portion of wire regardless, but was wondering how much impact it would have on the A/C systems function. Where is the compressor grounded to? What other items can I test with a test light or a voltmeter before I assume the clutch is unserviceable and buy a new one? The fuse is good and intact, but beyond that I do not know enough about the A/C systems on these cars to get a good start. A/C work has always been one of the very few mechanic jobs I actually pay for, but finding a competent Volvo mechanic in my area is almost impossible. Any help would be greatly appreciated!