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The alternator is most likely the problem, it isn't putting out enough of amps to charge the battery, but enough to keep it going which won't last long. Before assuming the battery or alternator, try your battery connections for corrosion or tightness. If you live close to an auto parts store they can check the battery and alternator to see which is the problem. The battery will not hold up long if running lights at night or other power consuming things.
the pump should be underneath the trunk behind right rear tire, if not follow the noise when the pump is running - the leveling switch is on the rear suspension arms - sounds like the pump is not pumping enough air or you have an air leak in the struts
This part is called the auto leveler or air ride compressor. If it has air ride then it is the compressor, If it is constantly running it is possibly the leveler switch that is mounted on the lower control arm that detects the ride height and tells the compressor to kick on.