Truck Cap 3rd Brake Light Wiring

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nvuk

New member
Jan 19, 2022
1
0
Hey all,
I have a 2021 GMC Sierra LM2 and looking to add a truck cap. I was wondering if anyone knows did GM provide a factory OEM wiring harness from the main fuse box back to somewhere to connect a seperate harness for the third brake light truck cap?

If not, any other help would be great.

Thanks
Vuk
 
Not that I have seen. See people tying into the left tail light. Need some sort of black box to keep from flashing, when using turn signal.
 
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