[Richard]

The Freemans and I spoke on the phone.

To answer the specific question, the air lines on the back of the aluminum six pack plate are not directly attached to the solenoids. There is a horizontal tube drilled into the aluminum plate. The solenoids when open connect to the tube. The outer 1/4 line on the back of the six pack goes into the square tank welded in the frame. One tank for left and one for right.

The Freemans have bypassed the tag axle add and subtract three way solenoids, and connected the two tag lines together. Still no go on the driver tag bag. So tomorrow they will fit an air line directly to the tag bag and determine if if will inflate and hold air. If it does, I suggest looking very hard at the tag axle supply tank for leaks.