Power Distribution issues

[randy4140]

Are there Tech articles on the PDC? If so I haven't found them. I seem to be having power/ground issues there (PDC)

If I turn on headlamps the truck shuts down. Will restart if switch is off. Also have no heater blower at same time. Engine code is no ECM communication. Seems to either be a power interruption or most probably a ground issue? Any ideas on where to start. the bottom of the PDC is difficult to get to!

 

[Me78569]

Use the wiring maps + the FSM i the downloads section to trace wires related to the the headlights

 

https://mopar1973man.com/cummins/articles.html/24-valve-2nd-generation_50/51_engine/electrical/

 

[randy4140]

Has anyone else had these issues with their trucks, I can be the only one with the thousands of CTD's out there. And the wiring diagram in the article, I cant seem to blow it up to print so I can read it?

[JAG1]

Randy start cleaning all major connections. Even the battery posts nice bright and clean.

Follow the smaller wires coming off the passenger battery. One of them has a factory clip type connection laying closer to the wheel well. That one has been a problem for some not being very tight. Check/ clean the grounds everywhere esp. the computer on the passenger firewall grounding.

 

The next most important is to figure out how to get the wire harness injection pump connector off. It takes sliding a clip up or down, can't remember, but once you get it off make sure all is clean and tight on each of the pin connectors. Some guys have had trouble there with the pin connectors some loose or the whole connector isn't seated all the way. Sometimes just unplugging and placing back on will do the trick. Do put dialectric grease on  the female pin connectors first before putting back on.

 

Give us updates as you go. Any of the above can't hurt on trucks old as ours.

 

Fill out your sig too okay? And welcome to the Forum, nice community around here.

[klcammie]

If you have 98.5 to 2000 check the big connection on the firewall the one with a white bale. The bale must be all the way to the left. On mine it was in the middle and was causing loss of signal to ecm. The ecm would shut off power to the lift pump causing truck to die from lack of fuel. Took me 3 weeks to trace down the problem.

[JAG1]

Kevin how did you figure it out after three weeks> Did you get a look at another truck an suddenly notice?