3rd brake light issue

[Countrys1500GMC]

Hey there. So I have an issue with my 3rd brake light. I had a leer camper installed about 2 years ago. Just took it back off to move and now my 3rd brake light isn’t working. It has no power to it according to the meter. The cargo light works still but the brake like does not. Checked the bulb and fuses. All good. The installer swears they never disconnect them. But I can’t find where the power stops. Any ideas or diagrams off how the wiring is routed? 
TYIA. 

[cfell]

There is a harness on the Leer, inside driver side rear of topper.  There are fuses there.  My 3rd light was failing due to poor connection at the harness.  There is a set of “mini fuses” under a cover.  Remove, clean and lube then recheck

[Countrys1500GMC]

Thanks. It’s actually the truck 3rd brake light. The one on the camper shell was working but I just removed the shell. 

[GMCustomerService]

On 7/8/2022 at 4:12 PM, Countrys1500GMC said:

Hey there. So I have an issue with my 3rd brake light. I had a leer camper installed about 2 years ago. Just took it back off to move and now my 3rd brake light isn’t working. It has no power to it according to the meter. The cargo light works still but the brake like does not. Checked the bulb and fuses. All good. The installer swears they never disconnect them. But I can’t find where the power stops. Any ideas or diagrams off how the wiring is routed? 
TYIA. 

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