Oem led tail light dim after brake

[Bstocky]

Hello, 

 

I have factory led tail lights on my 2015 Denali hd, wiring harness adapter in place. Have had them in for a few months now and just noticed tonight after the brake was applied for like 10-15 seconds or longer, when the brake was released the large C shape running light was barley on. The little side led in the tail light was illuminated normally, and after a few seconds the large C running light comes

Back on. This seem like a internal tail light issue? 
 

thank you 

[DCazares]

Did you find out what the issue was?  I'm having the same issue on my 2014 with 2016+ oem led tail lights.  Noticed it after my wife was driving my truck and I was following her this morning. 

 

Both sides do it identical so I doubt it's internal, maybe the resistors added to the harness?

[DCazares]

I just did some further testing and the rear running lights go dim after holding the brakes for 20 seconds. They go dim and go back to normal 10 seconds after letting off the brakes.   Any ideas?

Edited March 17, 2023 by DCazares

[Bstocky]

1 hour ago, DCazares said:

I just did some further testing and the rear running lights go dim after holding the brakes for 20 seconds. They go dim and go back to normal 10 seconds after letting off the brakes.   Any ideas?

 

Whatharness are you running? 

[DCazares]

I spliced my original with the 2016+ harness. Used this diagram and have been running it for 3 years, only thing is I never noticed it since I’ve never followed my truck while my wife drives it once in a while. 

[Bstocky]

16 hours ago, DCazares said:

I spliced my original with the 2016+ harness. Used this diagram and have been running it for 3 years, only thing is I never noticed it since I’ve never followed my truck while my wife drives it once in a while. 

 

yea I also followed that diagram and bought resistors off amazon. I tested another set of OE led tails from my buddy and they did the same thing, so I ordered a premade harness from the harness doctor and no issues since. 

Edited March 18, 2023 by Bstocky

[DCazares]

I think it should be an easy fix. I think the red wire is connected to the wrong wire in the diagram.