My 1992 Cummins W250 auto trans turned out to be the Computer/ECM mounted on front fender by battery tray. Mine only acted up in cold wheather. It started out with the ASD (auto shut down relay) clicking rapidly. In addition the water in fuel, wait to start and check engine light also blinked fast. In this state, the battery would not charge.
Fusing and Relays. Go to autozone.com and register for a free wiring diagram and powerbox diagram. Then look at your circuits. Check for fuses inline with the Alternator. You need a tickler charge for the Alternator to work and that happens after the Key is turned.
So either the signal from the Key is disrupted or a Relay is not turning on. Check those pesky Fusible links.
SOURCE: 96 dodge ram 3500 diesel
Check the large probably 100 amp fuse under the PDC cover. Is this a 12 valve or 24 valve engine? If it's a 12 valve, it may be a bad crank sensor. It tells the PCM to turn on the ASD relay which supplies power to the alternator field.
SOURCE: removing speedometer 1992 dodge ram 250
I don't know if it's the same as my D150. But it's pretty simple:
1) remove about six screws from under the upper lip of the dash face bessal and one under the overhand above the radio.
2) carefully jimmy the bessal straight out. It has about four spring trim-clips that will release under pressure.
3) this exposes the speedometer instrument cluster. It is one big assembly (speedometer, fuel, temp and elctrical guages, etc) attahed with about six #2 phillips face screws. Remove these.
4) There are three back contections on the cluster: two electronic and one mechanical. Carefully start to pull the cluster out along the steering column until you see the shift indicator control line ( a small fishing-line with a hook on the end) attached to a small steel flang on the base of the steering column. This can be unhooked with your fingers or needle-nose pliers.
5) as you pull the cluster further out you can reach behind and unplug the two electronic connections. The round one simply pulls straight out. The last (rectangular) one has a pinch latch you need to compress to allow the plug to come out.
your finished!
SOURCE: Charging problem on 1996 Dodge Ram 3500 Cummins Turbo Diesel
I had the same problem on a 94 dodge with the cummins. It seems the crank sensor that reads from a notch on the harmonic balancer was the problem Without this sensor reading that the engine is running the alternator wont charge. Possibly the same problem with yours
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