Fortunately, replacing your pressure switch is easy and doesn't cost very much. Once you disconnect the battery, the next and final step would be to replace your pressure switch. Your air compressor not turning off is much worse than not turning on, because if left running you could blow your fuse or even permanently damage your air compressor because it is being forced to work much harder than it was designed to, therefore drawing more power from your battery.
If your air compressor will not shut off and the pressure in the air tank gets high enough to activate your safety blow-off, the very first thing you want to do is disconnect the air compressor from power. If your air compressor powers on when wired to direct power, the issue lies in your pressure switch. If it doesn't, unfortunately, the issue may be your air compressor. If direct power turns you air compressor on, you know the pressure switch is the culprit. This can be done by simply bypassing the pressure switch and running power and ground directly to the air compressor. While the pressure switch is much more likely to fail than your air compressor, rarely the issue could be the air compressor itself, so before replacing your pressure switch make sure that your compressor isn't the problem. Naturally, when your pressure switch fails it will either not turn your compressor on or not turn your compressor off. Your pressure switch is responsible for turning on your air compressor when your air pressure is too low and turning your compressor off when your air tank has reached the designated pressure. South Georgia & South Sandwich Islands (GBP £)
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