What wires to tap into with tail lights?

[fxxkintallguy]

Hello,

I'm installing some fender flares with side markers on them and I don't know what to tap into at the back of the truck to provide power to the rear side markers. Does anyone know what I can use?

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[Jseiden420]

Do not tap into the wires for the taillights. I’ve see. Issues with the BCM when that’s done. I would tap into the trailer wiring. It’s easily accessible and won’t cause any problem with the BCM.