Third brake light not working

Hi,

If you are only getting that much power to the light, chances are there is an issue where the wires for the brake lights are spliced together.

On the passenger side under the dash, you will need to locate the instrument panel wiring harness. Inside the harness, you will find a group of white wires with a tan tracer. Follow the harness until you come to a splice where the wires connect together.

If you want to try, have someone wiggle the harness under the dash to see if there is a voltage change at the light socket. If there is, that is the problem.

I attached the wiring schematic below, so you have a reference. Note the schematic was only one page long. I had to cut it in two to make it readable for you. I did overlap then so you can follow from one to the next.

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below.