2002 Century cruise control issues

I have a '02 Freightliner Century that I bought last June. The owner had not seen his truck in 2 years and could not keep a driver in it. I now know why! The last driver in it thought he was a mechanic, and just cut wires and hoses and ran hot wires...UGH!!! What a mess i have dealt with, but i cannot seem to get the cruise control to work for the moving part of going down the road. The cruise can be turned on while sitting still and can bump the idle. I have replaced both dash switches and the micro switch on the clutch pedal, but that hasn't fixed the problem. Any suggestions as to what it might be, or places to start looking/eliminating? The air diaphragm has a capped off line that, according to the schematic, is supposed to go to the cruise control, but all the mechanics that I have talked to about it, say that there is no air involved in the cruise control at all. HELP PLEASE!!!

 

well i got a new normally closed switch to replace the old one and spent a hour on my head upside down to figure that some of the wires were hooked up to the wrong switches. now when you bump the cruise up and step on the brake it shuts the cruise off (normal). yea 1 small victory, but still have no cruise on the open road, the service mgr at freightliner ft worth told me that the capped off air line is supposed to go to the top plate of the transmission to tell the ecm what gear your in,just wondering if any body is familiar with this air line to the top plate??

 

still not fixxed i have had 3 mechanics look at it and all the micro switches work and i still think i have a mixxed up wires
on the air diphragm

 

the ecm had a surge to it and it affected the cruise and jakes. sent it to a programmer in arlington tx and for 495 dollars he fixed it and now we are cruising.