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This is only for OEM headlights not aftermarket headlights. For those that wish to add the 2014-2015 GMC SLT headlights, or the 2016-2019 2500/3500 HD headlights to their 2014-2015 Non SLT Sierra, this is the needed harness. This harness is a complete plug and play harness which utilizes 4 relay's for controlling all f
Save on 14-15 Sierra SLE/Work Truck to SLT/Denali & HD Headlamp Harness with a Gen5DIY coupon
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