Water Pump Wiring Troubleshooting & Repair Pump Wiring On 2018-08-19 by (mod) - wiring diagram of a a 4-wire pump circuit. Greg, I'll be glad to research this further as from your question and image I'm not confident I can give a correct answer right-off. Replace the switch and any burned wiring and correct the air charge in your pressure tank. Search InspectApedia for . WATER TANK AIR, HOW Basic motor testing with multimeters and ammeters Jul 01, 2015I obtained a 150 psi 6.0 scfm Porter Cable air compressor that had been thrown away. It has a start and run capacitor on the motor. Both capacitors were good motor did nothing. The power cord has a white, black and green wire. With the unit plugged in there was 122 volts between the ground and the black and also between the ground and the Adding a Soft Start to Water Pump Motors - Reducing Relay Mar 13, 2019I think that all of my wiring and components are good and the right way round, except that the impedance for the relay is 1550 ohms. when looking for a circuit allowing me to drive an air compressor (and maybe a small fridge) from an inverter rated for 300W, with a peak of 600W. The compressor itself draws 240W, but the truck's fuse allows