Don't have a wiring diagram but all the sensors do is just provide a completed circuit. Power through one wire and power out the other and break the beam breaks the circuit. A voltmeter/continuity meter should tell you which terminal puts out voltage and which one would complete the circuit. A direct wire between the two would complete the circuit and maybe help you troubleshoot if there is a sensor problem. I guess you figured out why the guy sold it now. Does he sell swampland too? lol
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