Cruise commander m install question?

It is a repeat of Serial data to the RS boards if applicable.  For the 4 pin you just need the 2 AC inputs and the 2 motor lead outputs.  Don't worry about the jumper.  G

So george the red wire is going to the center collector roller and the black wire is going to the ground correct. At least in the sd80 engine in the instruction install  described in the instuction manual. What or where do I hook the black wire from the 4 pin too since the black wire on my 6 pin  is not going to anything. Its just connected to the 6 pin only going  into the two holes show in my photo. Should I find the black ground wire comming from the truck frame and hook the black wire into this one? Do you follow me?

If I understand you correctly. Red wire = ac hot( center roller). Black wire = ac ground( attatched to truck frame). The blue and yellow wires are the motor leads that attach to the 4 pin gray wires as per the instuctions. Correct?

Your correct, but one of those other wires in the 6 pin is Chassis ground.  Should have been black, under the red on in your picture?  Maybe it broke off the terminal and that was your issue. G