1964 Wiring Harness Question

Howdy people, cosgig here. I have a question for your 1964 guys. I know on the 64 wiring harness at the bulkhead, there are only 2 plugs, and on the center of a harness I have there are 2 terminals on the center hump between the plugs, with big lugs and a slide spade terminal. On the back side facing the dash is a black and red wire. Question is, what fastens you those terminals on the engine side? Literally asking for a friend who had a wiring meltdown, and I gave him the harness. The one I gave him has the terminals, the one he had to take out does not. Any ideas? All input will be much appreciated. Thanks people for any help received.