Electrical Crane Hi-6s Users, I Need Your Help

I have a Hi-6S that I'm trying to use on my 1988 Coupe 5.0L. The factory harnesses have been cut off, but the wires are still good. The main harness I'm interested in is the harness that has a Red, White, and Black wires coming out of it. Not sure what to do with the black wire. I have identified the heavy black wire goes to a chasis ground. I have it wired up, but its not firing. The status light blinks on as its turned over, and it flashes when I turn the switch on. Any help on this will be greatly appreciated.

If all possible, can you take a pic of how yours is wired up?

Thanks for posting. I've reviewed the diagram, unfortunately this doesn't help. Although I'm pretty sure it's hooked up correctly, I'm thinking the box is just no good.