Third brake light not working properly

1997 DODGE DAKOTA

165,000 MILES • V6 • 4WD • AUTOMATIC

BAKERSADOZEN

MEMBER
1 POST

My 3rd brake light is connected to my interior lights, when I turn one of my interior lights on, my 3rd brake light turns on (while no other light turns on). when I press on the break my interior light and 3rd brake light turns off, but my 2 other brake lights turn on. How do I fix this? I need to pass inspection.

Jul 29, 2021 at 6:40 AM

MASTER ASE TECH

✓Experienced Mechanic
82 POSTS

Hi, my name is Dan.

It sounds like voltage is possibly backfeeding through the wrong circuit. I've attached a couple wiring diagrams that show both the Center High Mounted Stop Lamp, and the dome/cargo lamp. One thing to check is to make sure the correct bulbs are installed and not installed backwards. I would start by removing all 3 bulbs and then install one at a time to check to see what works.
Use a multimeter or test lamp and check for the correct power and ground at each bulb.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-check-wiring

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
Click here to log in and view diagram.

Jul 30, 2021 at 6:28 AM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.