Mine was tapped into the left brake light.
There's a little 1/2" hole in the rear of the bed that is located 3" from the top of the bed and 7" from the rear. Take your left tail light out and run the topper light wires through this hole and work the wires through towards the tail light area. Use a 12V light probe to find the stop light wire and splice into it. If your topper wire is routed to the right side do the same thing.
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