Wiring help for 3rd brake light on truck cap

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LSaenz

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Laredo, TX
Ram Year
2012
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Hemi 5.7
I recently failed my inspection because the 3rd brake light on my truck cap is not connected. Through research, I found out about the wire underneath the truck specifically for this purpose.

After wiring it up, the 3rd brake light still didn’t work. I tested the brake light itself with a separate power source and it works. I used a bulb tester on the wire underneath the truck, and it gets no power when the brake is depressed. How do I solve this problem?
 

Mpgrimm2

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Wire it into the the 7 pin trailer brake connector behind the bumper

M² Mods.
 
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