How to Power a Brake Light on a Truck Topper w/a 4-Way Connector
Updated 04/22/2026 | Published 04/14/2026
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Question:
Hi, I just installed a truck cap with a high mounted brake light on the rear on my 2022 Nissan Frontier and Im wondering if you have anything that can help me connect it to my 4 pin trailer plug located at the trailer hitch?
asked by: Anthony W
Expert Reply:
Welcome back Anthony! To connect your topper's brake light to your Nissan's 4-way connector, you'll need the 3rd Brake Light Logic Module item # PP20-702 and the Curt Wiring Harness item # C97NR.
The item # PP20-702 module is going to filter out the turn signals so only the brake light will come on on the truck cap. You'll be able to plug the item # C97NR directly into your Nissan's 4-way connector.
I attached a diagram below that shows what wires go where. You'll connect the yellow and green wires on the item # C97NR to the yellow wires on the item # PP20-702. It doesn't matter which yellow wires. The green wire on the item # PP20-702 goes to your topper's brake light power wire.
What do you plan on using your truck bed for now that you've installed a topper?
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Joe
4/21/2026
The install went easy enough but it did not work.