charging problem

[dirtdog]

I have a 93 D-350 w/cummins diesel it charges and discharges from time to time when I'm driving can anyone help me with how to diagnos the problem?

[74w300uteline]

clean your grounds

It's a good troubleshooting startpoint. Glad to see you posting again.

[DODGEBOYS]

the voltage Reg is in the PCM so you either have a wiring problem or the ALT is on its way out / if it is the PCM you can install a older 80,s external Reg and it,ll work fine / do a web search on it / it will turn your check engine light on

[dirtdog]

charging problem

The problem was with the cranshaft position sensor, not the PCM but that is good to know for future reference.