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Hello everyone, I have a 2017 L5P Denali, and I recently purchased a pair of AlphaRex Nova series headlights and switchback mirrors. After installing, I found out that my automatic DRL's no longer work, but I can still turn my knob for my parking lights. I have tried troubleshooting by disconnecting the batteries and "resetting" the BCM. What do you guys think the issues could be and how could I fix it?

Hey there, I bought some after market tow mirrors for my 2014 gmc sierra 1500 and yes unfortunately I went with amazon, but I got everything wired in except there wasn’t a running light wire for the turn signal which I assume this company just didn’t do. Has anyone ever had to wire in a running light wire inside the mirrors and know a wiring diagram for the mirrors or know if it’s possible to do it, thanks! IMG_7225.mov

I have a 2014 gmc sierra 1500, its been almost a year since i bought a pair of projector black light head lights. I have came across an issue just las week where the left side drl will not turn on manually or automatically. when locking/unlocking they flash normally, or when using the turn signal the work as well. i would also smack the headlight and it would come on, but not it wont come on at all just when turning or locking as mentioned before. Not sure if some wiring was messed up or the bulb or connections. bulb is as new as the head lights and no corrosion

To all the GMC guys...I've got the fix! Firstly, just want to thank @spurshot for inspiring me to put this into motion. Ever since I saw the 14+ GMC's, I thought to myself hmm...I wonder if it's possible to make those bright DRL LED's run the same at night. I probably wouldn't have dived into this if it wasn't for Spurshot's How-To on the Fogs w/Highs as I used the same idea with this. So here it is, using the same 1N4004 diodes: BCM X4 (Black Connector) Pin 1 to Pin 7 Pin 2 goes to Pin 7 on BCM X5 (Brown Connector) See pictures below for the schematics. BEFORE & AFTER And yes...I'm putting in HID's this weekend. Just picked up a 2015 Denali CC 6.2L/8spd in exchange for my 2014 High Country and the mods are still in progress! Enjoy

I just saw a Tahoe LT on my way home from work using the LEDs as DRLs at full 100% brightness just like the LTZ models. Yes, I am sure it was a LT model and it looked totally stock even with the entry level honeycomb pattern grille. He was going the opposite way so I couldn't stop him to ask. Someone out there has figured it out! Does anyone have an update for this mod?

Last week I noticed when driving into the garage, that one of my DRL/low beam lights was out. I have a 2015 with the halogen lights, separate high beams. I first read some old posts on here about how to get at them. No problem, I bought a new set of H11 bulbs and went to replace them. I put the new bulb in the driver's side first since it is easier, the new bulb worked. (that old bulb still worked as well). Then I go yank the air box out to get at the passenger side. put new bulb in. After reassembling everything I tested it out by turning on my headlights, and lo and behold, this brand new bulb does not light up. After inspecting the old bulb, I cannot see any sign of it burning out either, no black, nothing broken inside the glass. So my question is, would there be anything I can easily check that would cause this if it is a wiring issue? I'm not terribly worried about it now since I do very little driving after dark and I will be taking my truck in for an inspection right before my 36 month warranty runs out in June. Just wondering if this has been encountered before. I don't want to make a habit of replacing bulbs only to find out they are not the problem. Replacing the passenger side bulb is not fun.

I bought a 2000 Silverado 1500 about a year ago and ever since I've had it, my DRls do not work, however, when i pull my emergency brake my entire headlight system comes on, both headlights and my brake lights as well. I have new headlights i would like to install but i want to solve this issue if there is one before i put them in.

Hey Everyone, new to the forum and the truck, just picked up a 2011 Sierra 3500HD Duramax Denali. Truck originally from Canada and now in the US. Been working through some of the quirks from the previous owner. One of the things I am trying to track down is why the DRLs never come on. I have read a lot of users trying to disable DRLs, especially Canadian trucks for hunting and such. Thats not me. I just installed some Spec D Projector headlights with C's. That is the reason I would like the DRLS to work. Also I beleive the previous owner had HIDs (just a guess based on the remnants of double sided tape behind headlight housing where i would mount ballansts) and users try to bypass DRLs to extend HID life (from what I read) That being said. Here is what I have checked so far: All the fuses needed for DRLs Replaced Ambient Light Sensor Also tested C Lamps with battery and those are working, just not on truck. Looks like the wiring harness for the headlights has been altered slightly or extended but seems to be correct. I dont know if there is a diode in this year of vehicle- havent checked yet. Just starting to through it out there and see what sticks, going to start digging into it more shortly but wanted to get the conversation going (good or bad) to see if i can get this figured out. Appreciate the help. Move topic where ever it needs if in wrong section. Few picks of the truck when i got it to where it is now.

Hi there so my DRL lights stopped working. It started with one and now both are out..changed the bulbs and no fix..I changed the sockets as they were showing signs of burnt and no fix..checked all fuses and all good. Headlights always on and DRL do not kick in...any help please