This is very odd.I have more experience with DC rather than AC. I have never worked on a Electron Theory wiring. Very confusing for me. I did not like the install. Some how I cannot pair my remotes. Followed the steps not will not pair. No rapid blinking like out says. I would keep looking.Just bit the bullet and bought another one, works great. Range is great. I used mine to wire a 40 psi fuel pump to draw fuel from my boat to the vehicles fuel tanks. The ECM completes the ground for normal engine operation so that's what I thought the common was. So basically the Battery + and - are self explanatory and the common should be jumped from from the + (I recommend soldering the wires before inserting in the contacts) the null contact is the Battery + from the relay going to the load. So I had to put another relay in the project box to switch to ground. So now I can see when the fuel starts to sputter and and turn off the pump remotely. Would recommend but draw out your wiring diagram first! And always measure once and cut twice!
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