I have no power to the Aux Compressor and I'm losing pressure over a two day period. I checked the outlet with a meter today and nothing. I routed new power to the compressor by way of an extension cord and it worked fine. It ran until the pop off opened and then continued to run leading me to believe that there is a pressure switch somewhere. I can't see it on the compressor or in the compartment with the compressor. I see what may be one on the main manifold under the steering box. Any advice from you guys that may have experienced this.