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There are 3 terminals on the back of your motor head. Locate the 2 on the right. The middle is the common and the right is polarized. The sensors should have bell wire that will run from the sensors to the motor head. One of these wires should be colored. It doesn't matter the color. If not you will have to track it another way. Mount the sensors 5-7 inches off the floor and run the wire attached to the wall and ceiling securely, making sure not to pinch or break the bell wire. Strip 7/16 of the wire back to expose the copper and connect the colored wire to the far right polarized terminal. The white one will connect to the middle one. There probably will be another wire already there, just braid them together and and re-attach. Lights on both eyes should shine. To test, as the door comes down block or walk through the sensor beam and it should go all the way back up. Do a 2x4 safety reversal test after any adjustments. And we suggest a surge protector on all units. Thanks BB