How to Wire Up a Well Water Pressure Switch | Hunker Turn off electrical power to the well circuit at the main panel. Tag or otherwise mark the circuit Remove the cover retaining nut from the top of the pressure switch with the combination pliers. Lift Loosen all the screws on the pressure switch terminal bus using a screwdriver. Turn the screws in a Test wiring from the main panel with the voltage tester to ensure that no power exists.See all full list on hunker How to Wire a Well Pressure Switch | eHow How to Wire a Well Pressure Switch. Wiring electrical devices requires a certain amount of experience, but with proper preparation, the novice can successfully perform simple wiring tasks. Observing a few basic steps and following proper safety practices are the basics for wiring most home equipment. A familiarity with electrical tools and their..