The right brake light not working, left brake light only comes on when parking lights are turned on?

Tiny
KIWASABI1
  • MEMBER
  • 2001 MITSUBISHI ECLIPSE
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
Hello 2CarPros,

I have what seems to likely be a wiring related issue. My right brake light and parking light (same bulb) don't work at all. The right blinker light does work. I replaced the right brake light with a brand-new bulb and still got nothing. I also found out that the left brake light only comes on when the parking lights are turned on.

I haven't checked the fuses yet but it's likely not a blown "stop light" fuse because that would mean both lights wouldn't work. Also, there are a whole other slew of components tied to that fuse, and they wouldn't be working either.

I also think this rules out the brake pedal sensor for the same reason, since that would cause both brake lights to not work.

I bought a new brake light socket harness to replace the right side. I haven't tried this yet.
Friday, November 3rd, 2023 AT 8:20 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,753 POSTS
Hi,

You are correct about the brake light switch. Also, the fuse has to be good as well. So, that leaves one of two possible causes. Either we have a weak ground or the wire to the right rear brake light is open.

There is a splice in the wiring, so the first thing I need you to check is if there is power to the green wire with an orange tracer when the brake lights are on. I attached the wiring schematic below so that you have a reference. I highlighted and circled areas of interest.

Let me know what you find.

Take care,

joe

See pics below.
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Friday, November 3rd, 2023 AT 9:46 PM
Tiny
KIWASABI1
  • MEMBER
  • 198 POSTS
We replaced the taillight lamp socket harness, and this fixed everything. For anyone reading in the future I got an OEM part on Ebay for $30. So now both brake lights work, and the parking lights don't need to be on like they did before.

OEM 2000-2001 Genuine Mitsubishi Eclipse Tail Lamp Socket And Wire MR522591
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Tuesday, November 7th, 2023 AT 10:22 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,753 POSTS
Hi,

Thanks for the update and information. I'm glad to know the problem has been resolved. Also, chances are your fix will help others in the future. So, thanks for the information.

Take care and feel free to come back anytime in the future.

Joe
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Tuesday, November 7th, 2023 AT 6:31 PM

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