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Brake lights not working

Tiny
JARCHULETA19
  • MEMBER
  • 2013 KIA OPTIMA
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 125,678 MILES
So I replace the brake light switch, both light bulbs in the back and the fuse are good. Once I take out both bulbs in the back the middle light works, but when I put the bulbs back in it stops working.
Friday, October 25th, 2019 AT 1:55 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Welcome to 2CarPros.

It sounds like the ground is bad. The grounds for all three lights is common. However, there are splices in them. What I suggest first it to inspect the ground specific to the rear brake lights. I attached a pic. The pic shows the ,main ground for them.

Check that for continuity, make sure it isn't loose or damaged, and check for corrosion.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find. I suspect, the added load of the two additional bulbs is causing the ground to fail. They all get power from the same source, so this is my first suspect.

Take care,
Joe
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Friday, October 25th, 2019 AT 6:31 PM
Tiny
JARCHULETA19
  • MEMBER
  • 2 POSTS
Okay sir, I check them and they are all good. Still not working.
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Sunday, October 27th, 2019 AT 2:00 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Welcome back:

Can you upload a pic of the back of the light assembly so I can see what you are dealing with.

Thanks,
Joe
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Sunday, October 27th, 2019 AT 9:00 PM

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