I'm using a wiring harness from a 90 Dakota in my hot rod.
After 178,000 miles, the charging system quit working. I replaced the alternator, still not charging. The old alternator field tested good, but it had a lot of bearing noise, so I went ahead and replaced it anyway.

We determined the computer that controls the charging system wasn't doing the job. I remembered back in the day we could wire in a Mopar electronic regulator and solve the problem, so that is what I did. I chased down the blue wire (Ign power) and green wire (field lead off the alternator) that both connected between the computer and the alternator. I spliced the blue wire to the correct terminal on the new regulator and to the alternator. Then I cut the green wire from the alternator and connected it to the correct terminal on the new regulator. I taped off the end of the green wire that originally went back to the computer.

The charging system works great now.

By cutting the green wire to the computer, I am now getting a check engine light, and a code for an incomplete alternator circuit. The question is, can I connect the blue wire to the green wire going to the computer and turn off the code and the light? Originally, the blue wire came out of the computer with battery voltage then connected to the alternator field wire (two field wires), which went through the brushes and came out to the green field wire and went to the computer, as I understand it. Gene

you can try the field module that some of the alt/reg shops sell thats supposed to complete the circuit after you do the external volt reg mod.

I think it's just a resistor of unknown value.

https://www.ebay.com/itm/FRM-Field-...Chrysler-and-Jeep-vehicles-/152549520983

i put one of these resistors? in when i installed a stand alone regulator,it worked for a while,now my check engine light is always on

I connected the blue wire to the green wire going to the computer, and the light went out for about 10 minutes, before it came back on. It will turn the check engine light off after every restart, but the light returns after a few minutes of the vehicle running.
When the check engine light is on, it gives me codes, but if the light is off, I get no codes at all. When its giving me codes, it acts pretty goofy, I get code 34, 36, and 42, then it repeats all three again. The vehicle never had cruise control, and there is no code listing for a 36 code. I have an extra computer I carry in the tool box, I think its time to cover the light and drive until this computer bites the dust then put on the other computer. I don't see much sense in changing it out while the vehicle still runs. The other computer I have is for an auto trans and the vehicle is a 5 speed, so that computer isn't happy either. Gene