It is the regulator that is the problem
a battery will need 14.5-14.8 volts dc to charge and a fully charged battery in good condition will read 13.2 on a multimeter
as you say the regulator is in the ecm so get a good replacement from the wreckers or junk yard or get a reconditioned ecm for those shops that can recondition/exchange
SOURCE: Electrical Shut Down
More than likely its the alternator which has the regulator in it and ran down the original battery.
SOURCE: Need help with 1994 Dodge Ram Charging system Repair
Check your battery cables and connections at the starter and check the main grounds
SOURCE: Think I an have an electrical problem
there is a wire connected to the battery and alternator. the connection is bad have someone fix it. this happened to me too on the same car. gl :)
SOURCE: 1993 Dodge D350 diesel alternator not charging
Hi, I will keep this short, but just a tip on the tester they use, I had one bench tested and it showed up it was good and the built in regulator was good also. Put it in the auto along with a $75 battery, and the discharge light was still on!!. So, I checked all of the charging circuit wiring finding nothing wrong, and put a rebuilt alternator on. Took care of my problem, the alternator was intermittent, sometimes charging when they checked it at Auto-Zone, but stopped putting out when I put it back on the car. I lived 16 miles from the auto store, so it was a pain going back and forth, plus the cost of gas!! I would change it out if you can at this time. I am sure this is what is going on if all looks good under the hood as far as wiring. Check to see if you have the 75 amp alternator fuse under hood also. It may be gone. Make sure the hot cable to the alternator and wiring plug is OK. Change it out and you will be good!
Sincerely,
Shastalaker7
Please keep me posted on the out come and don't forget to rate me :))
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