I have a 2004 Yukon Denali XL and I just installed LED taillights for it. My rear lights and brake lights will not work but my Turn signal and Back up lights work just fine. I have been all over the fuses in the hood and on the side panel on the driver side. What Fuse am I looking for. They worked great for two weeks and then it just quit working so it has to be a Blown fuse because the Turn lights light up the LEDs and the Back up lights work great its just the regular running lights and brake lights wont work. I had the key in the acc spot and the brake lights worked for a minute and then quit again. Can anyone help. Please

Have you looked at the wires in the lights themselves? You might have a corroded or bad connection there somewhere. If it was a fuse, you wouldn't have gotten them to work for a second when you turned the key to "ACC"

I just installed them 2 to 3 weeks ago and I havent had it out of the garage except on nice days. Bit Ill check the connections next because I could swore it was a fuse. because its happening on both of the tail lights. Im at my wits end the left and right signals work, reverse light, no running lights or break lights? Im in desperate need of some help. I hope its the connection in the back but why would they work for 2 weeks then quit. I appriciate all of your help/ Ill check the connections now and let you know in a minute. Take Care

I checked the connection on the lights and they are installed right. Its where you just plug in the LED connector into the Stock connector and they look good no corrosion or anything.

Have you tried plugging the stock lights back in to see if they work? Sometimes certain vehicles don't like leds in the tail lights. Also, do you have a 3rd brake light in the back window? I'm not sure if the Yukon has one or not.. if you do, and that don't work either, it could be a fuse..

Thank Bud Ill try that, I really appriciate all of your help. Truly it means alot that this site has such nice people. I was on the Tahoe/Yukon forum and they were like 12 year old kids knit picking at everything you said wrong. I snapped like I should not have and fired back and got me kicked off which I regret because that is totally not me but they kept picking and picking. Very unprofessional. Thank for being helpful and most of all courtious.

The 3rd stop light over my back hatch is not lighting up either,

Always glad to help, or at least try to anyways

A lot of other forums aren't as well taken care of, for the lack of a better word, as this place. That'* one thing I like about the forum, so many great people who are always willing to help

Alright, it sounds like it is a fuse now. There should be a fuse called "brk lmps" or similar. I'm not sure if its in you passenger compartment or under hood fuse box though. I'll see if I can dig up something.

Take a look at the ones I circled in red. This is in your under hood fuse box:



and this is on your drivers' side dash

Thanks a ton, Ill try it after cool down because Im getting pissed and hot I need a break and go back later when Im not so wound up; Thank you. Take Care