Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Good evening and welcome to JustAnswer!!My name is ***** ***** I have worked for a Chrysler-Dodge-Jeep dealership for 19 years and I will do my best to help.
What is the voltage at the B+ at the back of the alternator? If 14v then you have a problem from the B+ to the batteries.. If it's not 14v then the alternator is not charging, you need to check the black for a ground and if good ohm the other wire to the ECM. If the wire is good the ECM on the side of the engine is bad, the PCM doesn't control the charging on a Cummins..
If you need anymore assistance feel free to shoot me a reply and don't forget to RATE 5 Stars before leaving the site so I get credit for helping you today..Have a great day,Brad
I closed your duplicate question..
There is no fuseable links on the two connector wires to the ECM. Have you ohmed the wires to verify they are not OL?
On gasoline powered engines, the charging system is turned on and off with the PCM (Powertrain Control Module) and ignition switch with engine running. On diesel powered engines, the charging system is turned on and off with the ECM (Engine Control Module) and ignition switch with engine running. The field circuit will not be energized until engine is running and ignition switch on. This voltage is connected through the PCM and supplied to one of the generator field terminals (Gen. Source B+) at the back of the generator. The generator is internally grounded. The generator regulates the field using pin-1 of the field connector (high side driver).
The generator used with diesel engines is internally regulated. The generator and ECM communicate for diagnostics, etc. If the generator regulator becomes disconnected from the ECM, it will still operate, but in a default mode.
I attached the wiring diagram.. You will need to ohm the Brown/Gray to pin 7 at the ECM..
I hope this helps you and in the future feel free to request me for all your Chrysler-Dodge-Jeep needs..Have a great day,Brad
You are very welcome...
Add anther ground on the black lead to the frame or ground and tell me if the alternator starts charging..