2014 headlights flicker when applying brake

[terryf2858]

Replaced battery and alternator and it was ok for a month now it's back. Has anyone found the fix for this one

 

[zora]

Have you tested the alternator output?
Have you looked at the brake lights to see if there is anything unusual about them when you step on the brake pedal?

 

[terryf2858]

dealer checked the output on old one, it was fine, but replaced it with new, so i would guess it is fine, nothing with the brake lights. But today i noticed the 3rd brake light is out, so i will have to replace it and see what happens.

 

[zora]

So you dont have a multimeter and the dealer does your repair work?

 

[terryf2858]

that is correct, unless it is something like a bulb, then I can do it.

 

[zora]

So why aren't you going back to the dealer and telling them you still have the problem?

 

[terryf2858]

already have done that, they have no solutions, even one of their mech's has the same problem, and they have no bulletins from GM. so next they will be checking all the grounds. internet ideas say it could be a ground so they are willing to look at those next, when they replace the A/C condenser that is leaking.

 

[terryf2858]

3rd brake light bulb was out, replaced it and the flickering is a lot better.

 

[EricMondy]

Sounds like a failing alternator. Don't see a high powered stereo system on your mods list but if you have powerful amps and stereo it'll wear out your alternator prematurely if not set up properly.