79 Newell air leveling?

[Rich Farr]

79 Newell air leveling? We have recently purchased a 79 Newell and there is no info on the air leveling. There is no brand name on the system and it is probably not original equip. It is non-computerized with a master switch, a buzzer/light and separate switches for each corner. ignition off, I can hear it click on all 4 quadrants as the switches are activated in both the up and down position. It acts like it wants to work, but no leveling. Can anyone help us obtain some operating instructions or schematic for this older air leveling system?

Thanks in advance.