First, thanks for a great place to get help- the factory wiring prints have helped tremendously but I seem to be running into a specific (to this model) problem. Btw it’s a 1990 3.0 liter automatic cab n chassis. The orig harness was eaten entirely in two by rodents, orig plan was to use a terminal strip to join each wire. I proceeded with this until owner decided he did not want any splices/joints in harness. Scrap orig harness and awaited next one he would provide. Bought on internet-wasn’t from this type vehicle, not even close. Next, was very close and started installing, when I removed the hard plastic conduit that runs across front of intake......EVERY wire had at least 2 butt connectors crimped to it-disaster. The prob I’m having is with pins 17-20 on plug “c” to ecm. None of the wiring prints show pins here(that I have been able to find)but I know I don’t have cab n chassis prints. What I need:
Is there a place I can buy a quality harness for this combo? 3 liter auto trans 2wd gasoline fueled. I have tried to patch harnesses together then ran into 2 of the ecm module plugs won’t plug into module!!!! AAAHHHH!!!
if anyone can direct me to a place that we can get a engine harness at a reasonable cost I would be eternally grateful....

Scottintulsa