Been away from this site for a while. I have 40+ years with a Navistar dealer working in mainly medium duty (MD). Parts, Sales, Service. Now mainly do troubleshooting mostly on MD. Something new to learn everyday. I just love the electronics!! Lets take a 2000 era desktop PC apart, stick it's individual parts all over the truck, do the same for the ABS,
Trans, Body etc ECM's, multiplex them and tie it all together with about a mile of 18Gauge wire. Then run the truck thru rain, sand, mud, ice, road deicing chemicals, temp variances from -30f to 120f. What could possibly go wrong!?!