So I’ve got an autocar yard dog and when applying the trailer air supply no air comes out the emergency glad hand. It was working previously with a new TPV and it also just got a new air dryer assembly as yearly service. I’m the last 30 days. MV-3 also seems to be working just fine knob pushes in and you can hear the air supply. I don’t have a diagram to see where there’s a valve between the two parts or if there’s something im missing
