brake lights not working?

1999 MERCURY MOUNTAINEER

124,000 MILES • V8 • AWD • AUTOMATIC

REPAIRNEWBIE

MEMBER
1 POST

The turn signals and tail lights work. My third brake light works but my regular brake lights do not. Any thoughts? I replaced the brake light switch already. Also I do not have a fuse box chart to tell me which fuses are for what. Thanks in advance for any help.

Jan 1, 2009 at 11:01 PM

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

Good morning,

If the third light works, it is not a fuse. The wires for the rear lights come off a splice with the third light.

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

I attached the diagram for you to view. Check the splice if you can find it. Check the light green wire at the tail lights for power as well.

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

Roy

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Professional Diagram for 2CarPros Members
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Jul 31, 2021 at 4:27 AM