I'm trying to trouble shoot a 2013 RAM 4500 Ambulance rear Air bag Suspension issue. I can't find a schematic or anything showing what the valves are used for in the air system. There is a solenoid mounted beside the receiver/dryer and if stick a pick in the hole on the bottom of it, the solenoid allows air to fill the bags. VIN#3C7WRLBL3DG535501. Any help would be appreciated.

 

Can you find a service manual for it? I believe they are published by Bishko..... Might be able to find a PDF version on amazon, or ebay.