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Originally Posted by Bongle
Our compressor pressure switch is wired so that we have the yellow and white wires (signal and middle of PWM cable) on one side, and the black wire on the other side. We never quite figured out how we were supposed to wire it, but that configuration seemed to be working fine.
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That won't work. The RC digital inputs have an internal pullup to 5 volts, so you need to connect switches between the signal and ground pins.