I HAVE A 2000 TB105 DOES ANYONE KNOW WHERE THE CONNECTIONS ARE FROM MACK TO PUTZ. I HAVE POWER ON X88 WHEN I THROTTLE UP AND DOWN WITH THE REMOTE SO IM GUESSING ITS THE MACK CONNECTION? I CHECKED THE MICRO SWITCH ON THE CLUTCH AND IT IS WORKING,ALSO THE CRUISE WORKS ROLLING DOWN THE ROAD

theres a bunched up loop of wires on the passenger side of the cab under the hood. I'm sure don will chime in with some pics

It's in front of the passenger-side firewall.  The picture shows an older style connector, wrapped in cable armor.  They could fill with water and grow green stuff.  Yours might have a DIN plug or two flat plugs, but they are in the same location.

Check for burnt wiring, on the header pipe.  You say signals get to X88, so 4F133 isn't blown.