:question: I have a 88 Winnebago 37 ft/tag axle. Road pressure of tag is controlled by air bag suspension automatically. The air pump runs when ignition is on and does not cut off. I have not found a pressure cutoff valve yet. At ignition off the tanks bleed down. I have found no leaks in system using soapy water. Does any one have a wiring and plumming diagram? I would appreciate any helpful suggestions.