Under the hood by the latch in that black box.
Mopar part # 5281090
Power and ground
The asd relay is located under the master cylinder close to the battery. The other relay under the master cylinder is the starter relay, but it is away from the battery. Hope that helps.
Dodge full size van b series B150,B250 all are rear wheel drive with 3 engines v6, 318,360
In the oil pan.
It may be an internal regulator in the alternator. The engine computer is also the voltage regulator.
Back of the engine next to the distributor.
my 94 dodge ram van b150 has a 22 gal tank, gets 16/17 gal a mile city/hwy and gets about 352 miles to the tank
Loosen the alternator bracket, move it out of the way. The thermostat is at the end of the upper radiator hose where it curves into the engine
the chiltons manual for my 1990 B150 dodge ram van states 80 inch pounds. For a Ram 2500 with 5.9L Cummins 12 valve engine. The torque should be 18ft-lbs or 24Nm.
If it is an A/T you add the same place you check it. If it is a Manual transmission, then you add lube under the vehicle on the upper side of the transmission.