You should return your harness and get the harness zmnypit custom makes. I just installed my headlamps using his harness and it turned out well. No need for nasty extra wires and fuse taps. Direct plug and play.
I have a 2015 GMC Sierra Denali. I'm trying to put the upgraded GMC Denali headlights in it. Being that both trim levels are Denali, will I still require the special wiring harness?
I'd like to confirm; if I have a 2015 Sierra Denali I can order 2016 Sierra Denali LED headlamps and install them into my 2015, correct? If so, being that both are Denali's, would I need the gen5diy harness?