Archived 2005 5.9 manual nv5600 electrical problem.

[Mattsdog11]

This truck is new to me as of about 2000 miles ago. It was running great and has recently developed a problem that has left me roadside once. And had to limp home the second time. The problem is that when turned on the truck runs great. And will rev, move, drive, and generally function as it should unless you punch it or rev it up around 2000 rpms. If and when you do that the some dash lights will flash, I will loose the fuel gauge reading, the truck will die, and I can't talk to it with my snap on Solus. It will crank and crank with no start.*
My first troubleshooting attempt to fix it led me to see all fuses, breakers, and relays were good. I cleaned the battery cables and when I reattached them, the trucks fuel gauge worked and it started right up like it should. I drove it "fixed" for another week 5-7 times about a total of 200-300 miles with no more problems.
I went to take it to town the last time and as I got up to 70mph, it did the same thing with the dash lights and quit. I unhooked the drivers side battery cable for 15 seconds and it would start and run. Tried to drive it home and it did this 4 more times. I finally figured out that if I kept the truck under 2000 rpms that it would rune fine.*

P.S. I did install new battery terminals on the battery cables and the smaller positives and negatives at the batteries between the first occurrence and the last. They are crimped on high quality terminals and bolt on battery battery terminal adapters. PLEASE HELP!!! I have looked all over the internet and can't find this issue anywhere.*

 

[jhenderson]

I'd start by checking ALL grounds. They have been known to be problematic. This includes all the ground wires that attach to the body, such as the ones at the fenders near the hood hinges and the one that goes to the top transmission bolt.*

 

[Missouri Mule]

When the truck was running good did you hook up the code reader?

Punching the go pedal and/or going over *70 mph sounds like a electronic problem. Ecm or sensor or other computer that sends or receive data that would set off warning lights and mess up with engine running or startmg.*

Try spraying out connectors to compents that have any connection to you problem. ( contact cleaner, l start with ecm.)

 

[Mattsdog11]

I will check all the other grounds that I haven't already checked. The computer didn't show any codes that I can recall. I was told by the guy that I bought it from that the ECM went it on him on the way to Montana last year and he had a dodge dealer change out the ECM. Not sure what all was done but it does look new...ish.