2000 dodge 3500 with 5.9 cummins hard stating was only when cold but now getting worse what can it be

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

SOURCE: 2005 DODGE 3500 CUMMINS SERPERTINE BELT ROUTING

Check for a diagram either on or around your engine or on the underside of the hood of your truck and if not there then you need to either buy a chiltos autoguide for the make, model and year if your truck but check it out first and see if there is ,one in the places I suggested or even near you r trucks radiator or on the side.

SOURCE: 2007 dodge 3500, 5.9 cummins,engine light on,

my 2007 dodge 5.9 cummins all dash lights abs, parkbrake, check engine lights are on. airbag, and speedometer not working