I feel your pain Bob Had the hood up on the truck yesterday performing a little electrical modification. These old Dodge Diesels are noted for going through Voltage Regulators on a regular basis, and I was determined to figure out why. Looking at the diagram for the Truck, it was apparent that the normal Ignition Circuit, which provides the Voltage Regulator with a reference voltage, also feeds a number of other circuits, some of which are easily compromised. If just one of these associated circuits has an issue with poor connections or a mild short etc., it can pull down the entire system, dropping the voltage below the VR's threshold, forcing it (and the alternator)to remain active the entire time the engine is running, overcharging the battery and burning up the VR. To test mine, I started the truck, and unplugged the VR. I took a voltage reading off the Battery and a voltage reading off the 2 pin connector for the VR. I had full voltage at the battery, but only 11 volts to the VR.... BINGO... just as I suspected, the VR was in a constantly active state. To fix this issue, I cut into the wiring harness where all these circuits feed by the ignition are spliced together, and then separated the two wires from it that are associated with the charging circuit. I then installed a relay using the old ignition circuit wiring as a trigger for the relay, and attach the two charging circuit wires to the output of the relay. I ran a direct feed from the battery itself to the relay as the new Reference Voltage signal for the VR. In short... the Voltage Regulator now takes its reference voltage directly from the battery itself... and it works wonderfully! I also found the cause of the voltage drop in the ignition circuit, but that's for another day.