Opening your garage door with your light switch: Difference between revisions

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-The wiring is very simple. There are only two wires, with the relay spliced in. The low beam and ground run from the headlight to the relay, and the same two wires come out of the relay and run to the opener.
+The wiring is very simple. One low beam and one ground run from the headlight to the relay. Two other wires go between the relay and the opener. The relay acts as a switch, and when it gets 12 volts it completes the circuit and activates the opener.
 As for connecting the relays, you may have to solder them, or some may use crimp connectors. The back of the relay box should contain information about the circuits and connection points.