Just wanted to add, grey is also the brake light wire. In case someone sees this thread and is wondering which one is brake. It looks like turn signal is just controlled by the brake wire being sent a pulsing/flashing signal.
Per the electrical manual:
When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the front and rear turn signal lamps through there respective control circuits.
You can see in the chevy electrical diagram it is listed as stop lamp but no turn signal is listed.
Colors in the diagram show different because colors coming from the truck harness (green yellow, brown, white green) are different than the ones on the tail light harness (grey,orange, and yellow)
2015 Z71 2WD Crew Cab Long Bed Cyber Grey Metallic
Ready Lift 2.0 leveling kit, OEM Fender Flares, WeatherTech Mudflaps, Morimoto HID Kit, K&N 63 Series intake, JBA Catback Exhaust, Rough Country Hidden Bumper Mounts and 30" Light Bar, 17" Black Rhino Tanay wheels, Goodyear Duratracs, Go Rhino Sport Bar 2.0
Last edited by spoonman; 03-30-2016 at 09:38 PM.