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5.9 Cummins charging issue

1
Hello everyone, 

I’m having an issue repairing a customer vehicle that does not charge hopefully someone on here has a bit of experience with these. Alternator is brand new installed by customer. There was no positive at the field circuit and diagnosis led me to replace PCM. After PCM replacement the truck will still not charge. He also reported no a/c and shifting issues after PCM replacement which urged me to replace engine speed sensor after verifying no rpm signal present. Vehicle will still not charge. I threw in a battery temp sensor just to make sure there was no issue there and still it will not charge. Gauge cluster shows no rpm but will move if I wiggle the connector. Anyone have any ideas or tips?

Vehicle is a 96 dodge ram 3500 Cummins engine. Gen light does not illuminate although vehicle is not charging but passes self test prior to turning on vehicle. I have been searching for info but I am not sure if cluster provides any input to make the truck charge
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2
Follow up for closure. PCMs are specific to this generation of trucks. Had to send the original one out for repair.
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