Here is what I found. When the pressure hit the set point which in my case was 40 psi. I expected the pump to shut off. I contacted BB I didn't realize the air tank had to pump up to 95 psi. If had waited the unit would have shut off, which it did. I may need to come directly off the battery anyway, because what little running I did testing it, the cig lighter connection got rather warm. Stan
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