Light wiring for truck cap (camper top)

My 2000 Tacoma has a blue wire and a white wire (neutral) exposed near the rear tail light, and routed to inside the bed liner for easy access. My camper top, or bed cap, has a dome light with a black wire and a black/red striped wire. The tail light has a red wire and a black wire.

Could someone help me in figuring out how to connect the bed cap upper tail light to function with truck brake lights.

I'm pretty sure the blue and white wires were used previously to hook up bed cap light.

Thanks

 

Tap into the truck's brake light wires. I'd use a quick disconnect type connector in there somewhere so the shell can be removed if you ever want to.