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On the back of the compressor is a connector that you unsnap. That is the wire that goes directly to the compressor clutch. Well at least on the older AC's it is. Anyway, if you push a wire up (if the wire is too small here is a trick, strip the insulation further back and fold the wire over so the diameter is doubled). Insert the wire on the side of the connector (repeat in the connector first) that goes to the compressor and touch it to the plus battery terminal. The reason for doing the connector first is that do not want to go fishing for a connection with a hot wire in the meat hand. The hand wanders over to a ground and the sparks can go flying. If you are cautious and safety minded, use as switch and after you get the wires into place, flip it. You should be rewarded with a click and then see the clutch move just a bit. You can try this with the engine off, lowers the background noise and it’s a simple test. If you do get the click, then start the car and try it again. If you hear the clutch go click and the compressor start growling you have a place to start. No click and the clutch will still not move and most likely you have a compressor clutch gone bad or ground issue still.
I have seen a lot of green up in those connectors and in fact have replaced all of Inga's with crimp connectors. I have an 86 and that wire was pretty much as we say down here "necked" as is insulation had fallen off. That along with the green gunk inside the connectors led me to do away with them.
Good Luck,
Paul
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