Single spare wire as provided in previous gens factory wiring harness for third break light on a truck cap.

[steindog]

Truck caps are starting to become available and I've yet to find out any info on the factory wiring harness as it relates to the single dedicated truck cap third break light wire that was provided on previous gen trucks. I didn't see anything in the manual or during online searches. I briefly looked around under the truck around the rear corners and spare tire and didn't see it yet. I know it's still early in the game but if they kept this smart feature it's already there and it's just a matter of locating it and verifying it's function. Anybody have any info on this? Thanks in advance.