Reinstall your stock lights FIRST to make sure the lighting system does indeed work. Then get back to us.

Im selling my OEM Taillights and equiooed with Blue dots Proffesionally installed which make your brak lights a Purple haze light come from the tail lights. It has enough red to make them legal the Sheriff said. I did ia ride slong with him because he is a friend and it was intense, Being a cop would be an adrenaline rush every day

LEDs can cause problems. The ones I used had a small circuit board on them so I could plug them right in with no problems.

My tail lights have circuit boards in them but the Front turn lights mess with the rear making the lights not work except for the turn signals.

Ok I have another problem that arose when I installed my regular incodescent light bulb , I installed it and my back LED'* worked just like new, but when I turned the key of and close the doors and turned the lights off I looked and the LED running lights are very dimly lit. I dont understand. If isnt one thing its another. So much for trying to make my Denali look good and I though the led would give me a life long lasting tail and brake lights. What would cause them to stay on> its on both sides so its not a knicked wire leaking voltage to the tail light. Has anyone ever heard of this before?? Please say Yeas and here is how you fix it. Take Care guys and I appriciate all your help.

Was your LED lights the rear or the front. Because my tail lights are the oned with circuit boards in them. Its a whole new tail light with circuit boards on the inside and plug that come out of the wholes that line up with the stock sockets

LEDs have a lower resistance than normal bulbs, so sometimes, the small amount of electricity in the circuit after the vehicle is shut off can keep them dimly lit. I had the same problem in my interior lighting. If you replace both front led bulbs with the incandescent bulbs, do the back still stay dimly lit?

I dont have my old tail lights anymore i sold them. The Led lights are the whole assembly. Its weird because after I charged my battery and drove the vehicle and I turned it off after I got home and they are not on anymore. Thank God.

this is why i just vht my tail lights, fancy circuit boards etc are a pain in the ***

When this happened to my brother'* truck, turned out to be a loose ground wire that we had to track down to on the frame.