Two problems related to wiring have been reported for the 2004 Dodge Ram 3500. The most recently reported issues are listed below.
Trailer turn signals & brake (left) not working on factory 7 prong trailer adapter, truck indicator is ok, no signal to "left" in the wiring loom from the pdc/fmc to the factory 7 prong trailer adapter. (0 voltage), right turn, right brake, running, trailer brake & battery charge are fine. Dealer wants 1000$+ to fix/replace a defective pdc/fmc. Had not I done a walk around this could/would of caused an accident if I was making a "left" turn, merging or slowing down/stopping. . Bulbs are all good and independently checked with a 12v power source.
I purchased my truck in may 2006, since I bought the truck it has had a vibration on start ie from stop when I start moving the truck has a vibration. I am now on the third rear drive shaft assembly in my truck at 65k miles. Also have had to replace a blown front hub that separated at 60k miles with no previous problems or warning. Have had over 3k worth of electrical work done at dealership including pcm, wiring harness, fca, injection pump and so forth and so on. Still have tons of electrical issues with truck. And now at 66k miles the fuel sending unit has gone out for the second time.