If your engine is running and you raise your jacks the bags should automatically inflate. You have to wait until your air pressure gauges are at around 110 PSI before you raise the jacks. If you do all that and they do not inflate you have a bad solenoid. A call to Freightliner can verify this. 1-800-385-4357.
2001 National Tradewinds 7370 300 Cat
2011 Jeep Wrangler Unlimited Sport
Officially fulltiming. The Journey Begins