yellow wire
If I am correctly understanding your question, you want to ground the side of the 14 pin connector that comes from term 86 at the ac relay. I may be incorrect but it seems this would disable the function that cuts out the ac circuit while the engine is cranking, thus taking voltage away from the starter during cranking. I do not remember which side - male or female - of the 14 pin connector comes from the ac relay. If you accidentally ground the side from the starter you will have a dead short when the starter is cranking causing a fire.
I may be missing something but what is the reason driving your intent to modify the factory electrical system. My 82 sc is wired as factory and functions as it should.
As I said, I may have missed something earlier in your post.
Hope this helps.
Dave
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