14-15 Sierra DRL Harness DRL Function:Fog's as DRL's (250233) the vehicle controls the operation

the vehicle controls the operation of the exhaust bypass valves

If you choose this option

Let your Supercharged ZL1 reach higher performance levels by coupling it with a Cold Air Inductions Inc

Fenders are shipped in primer form and must be painted

14-15 Sierra DRL Harness DRL Function:Fog's as DRL's (250233) the vehicle controls the operationThis harness will remove DRL function from your headlamp and can either leave it so your Sierra has no DRL's or we can make it so your fog lights become your DRL's. If you choose to have your fog lights as your DRL's you also have the option of keeping the fog lights on with the highbeams. This harness is needed when installing HID or LED headlight bulbs into your GMC Sierra as there is less voltage during DRL mode which can play havoc with the HID