[77newell]

On my 93 coach, compressed air from the supply tank passes through a ball valve mounted ahead of the drive axle and splits at a tee with each of the two lines going to the center port of one of the 6-packs (front and rear). A drilled passage in the 6-pack passes the air through the base plate and out the opposite side and thence to a tee that splits it to supply each of my two rear HCV's. While passing through the base plate there are drilled passages to each of the "raise" solenoids.

So, Richard, you are right without me being wrong. The advantage of knowing that the plumbing is arranged as mine is is that by turning off the ball valve supplying the suspension system and watching the pressure gauge on the rear 6-pack supply you can determine if a leak is in the suspension system or some other system which would be shown by the rate of pressure drop on the dash "supply" gauge.

As someone at Newell told me, I've spent way too much time under the coach.