Have been looking online for a complete 1999 Dodge Ram 2500 wiring diagram, with Cummins, either comes up for just the radio or for a Dakota. Thanks in advance.
You need to find and either download or buy a shop manual. The "diagrams" are not drawn like our older stuff. They are page after page of annoying partial diagrams. There does exist various breakouts of just the ECU for various years..........but they are all different depending on the engine, Magnum, hemi, or Cummins