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Chevy GMC upfitter AUX switch 5 wire location and Third Brake Light Removal 2020 2021 2500 3500
I can tell you what the Gm Instructions link is below I am not convinced that drilling a hole to pull them threw will be any easy task sure easier the taking the complete spoiler off because any wires large enough you would have to drill a hole anyhow. I do like that you could silicone the backside of hole also if you did remove spoiler. I new my wire were small enough that I wouldn't need to drill a hole and I wanted to see how much work it would be to change this brake light, It will be no quick task to change a 3rd brake light hopefully this helps or answers some questions
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www.gmupfitter.com/files/medi...
Also See AUX switch install Video at
• 2020 2021 Chevy Silver...