MadProf

Ohhh - fabulous - thanks a lot for the detail with the wrench - I can do that! Fortunately, my hands and arms are relatively small but I got good strength - will give it a whirl. Been raining for last two days, so have not had chance to check. Yep - and there were lots of them done by previous owner - that person's favorite type of connection: butt connectors - yippie! Been tearing them out whenever possible and solder/shrink wrap or just replace with proper wire. Thanks for suggestion as well!

Thank you Moparman. Will give the wiring another once over. I still have those voltages & ohm settings somewhere when I tested the VP 44 in Jan - I don't drive this beast, I am just the dedicated fixer of it - belongs to hubby who is about ready to drive it off the cliff - the truck seems posessed - belonged to Jimmy Stewart (well his estate) and it would just come on at night and play country western music - certainly not a station we'd listen too. He'd have to go out and turn radio back off and mind you, the truck was locked the whole time! I am not that ghost oriented, but makes for interesting conversation?. It's the stinking wiring on this thing, and I have some sentimental attachment to it. So will try to keep running as long as I can. will update on progress - got a chemistry lab to teach today, though. Weekend will be happy wiring mad prof style.

Rrrgh- I did not want to pull the VP off again - so will start with grounds & wiring, although I already put dielectric grease on any possible connection, but none-the-less, it has been really wet & moisture gets in everywhere. Thanks a bunch for help. If someone else has any other thoughts - they'd be super appreciated. Thank you!

Aloha - I am back from Hawaii! And apologies if this was answered already somewhere else. Here is what happened: It's a gen II 2002 24 valve diesel 3500 Changed VP44 and ECU in Jan 16 - truck ran fine other than issue with TPS - which we changed as well (sometime spring 16). Had "no-start" issue with error 1689 a couple of weeks ago and swapped out the fuel relay for a new one - truck ran fine but pretty rough - felt like missing cylinder. Today truck started, drove around for a bit (but ran rough); we shut it down, tried to restart a while later and now, no start again. Pulled codes and it is now reading 1689 and 1690 - swapped relay out for another one - but truck is dead - (well, semi-dead) - starter works, lift pump works (has pressure), but no fire. We had a ton of rain and moisture (live in hurricane country) - could it be wiring, i.e. between ECU and VP44? Any help/ideas are greatly appreciated!