Anyone have the wiring diagram for a 1994 Ram B350 van? Specifically I need the ECU pinout and the wiring for the alternator field circuit. I'm getting a code 41. I replaced the alternator, the ECU main relay and the positive and negative cables. First thing in the morning the code isn't there but after 10-15 mins the CEL comes on and the occasionally the alternatore overcharges or undercharges.
Any ideas?

 

Sounds like the voltage regulator (which, unfortunately, is IN the PCM), is failing.

 

Thats what I'm afraid of. Hope not. Any idea which ecu's will interchange? It's a 5.2.

 

My guess would be any PCM out of a dodge van/truck/dakota with the same engine and trans.