Wiring help. Truck cap 3rd brake light??? 06 Ram 2500

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I've been on multiple dodge forums looking for some help with none to be had. I have the manual for my truck and the wiring diagrams are in there I just don't know how to decipher them.
So my question is. Does anyone on here have a 2006 Dodge Ram 2500 that they have wired in for a truck cap. I bought a used cap that did not come with any wiring instructions. So far I have found out that the wires near the spare is a good place to start, and the White/Tan wire is the break light wire. Does any one know if this is correct? Also I need to know what colour wire is the 12V constant, for the caps interior led light.

Thanks in advance for any help.

 

[92 coupe]

Yep white/tan for stop,at the taillight connector pin 4. Your only constant would be in your trailer wiring red/violet pin 4.

 

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Yep white/tan for stop,at the taillight connector pin 4. Your only constant would be in your trailer wiring red/violet pin 4.

Thats what I'm talking about. THANK YOU!!!!!

May it snow large volumes in your riding area.

 

[SLDHVN]

its common to see the topper wiring tied into one of the brake light, no guessing game there on which wire is which.

 

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Just a bit of a FYI. I ended up taking the ground (Black wire) and the Power 12v( Red/Violet wire) from the main wire harness right beside the spare tire. The white/Tan wire I took right from the right side tail light.

Let it snow!!!!!!!