The left brake light and turn signal are not working

Hi,

The brake and signal lights work from the same power supply. I need you to first check to see if there is power to the light socket. All you need to do is take a test light or multi meter to check.

If you look at the attached pic, you will see there is a brown wire that supplies the power. Check that wire in the socket that for power.

I need to know something as well. When you remove the light assembly from the truck, is the rear of the light housing a printed circuit board?

Here are a few links you may find helpful when testing:

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

______________________________________

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

Take care,
Joe