I have a 2004 ram 3500 dually 6 speed manual with a Jacob's exhaust brake and 300k and counting if that matters.

I have an issue with the Jacob's exhaust brake turning on. I've tested everything to just to find no issues with the vacuum system, electrical, or the viable its self.

If I take the green wire that plugs into port 42 on the ECM and ground it the brake works with the switch pulled or pushed in but no led light.

Please help I don't know where to go from here.