16-18 Sierra 1500 Non-Denali to 16-18 1500 Denali Headlight Harness GMC "C" Nightime Function:Like Factory (250540) INSTALL INSTRUCTIONS-CLICK HERE

INSTALL INSTRUCTIONS-CLICK HERE

This harness is for all radar detectors that use a phone cord style connector (RJ11)

if you select the map update you will be receiving 2019 maps

This harness eliminates t-taping into the factory harness when installing load resistors

16-18 Sierra 1500 Non-Denali to 16-18 1500 Denali Headlight Harness GMC "C" Nightime Function:Like Factory (250540) INSTALL INSTRUCTIONS-CLICK HEREThis is only for OEM headlights not aftermarket headlights. This harness is for those with 2016 2018 GMC half ton Sierra, Non Denali models and are installing the 2016 2018 GMC half ton Denali Headlights. Harness is plug and play with load resistors to compensate for the addition of LED turn signals. Harness is available in 2 different options. Factory DRL will be bright during the day and dim down at night (250540) Bright at night: DRL's will remain