ok, so the next question is does the air come on? when you turn the key to on (you don't have to start the truck) about 1 or 2 seconds later you should hear the air pump come on, the pump is behind the drivers side rear wheel up behind the wheel well/axle area. you should able hear it kick on, the pump airs up both rear shocks at the same time on the same air line there is just "T" splitter that goes to both left & right shocks.
one of 3 things is happening
1. the air pump isn't working, or works but then leaks the air pressure
2. an air line is broken/leaking
3. a shock bellows is bad/leaking
one of 3 things is happening
1. the air pump isn't working, or works but then leaks the air pressure
2. an air line is broken/leaking
3. a shock bellows is bad/leaking