Hazard, blinkers and brake lights not working

1993 FORD F-150
313,236 MILES • 6 CYL • 2WD • AUTOMATIC
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GENE COXIE
  • MEMBER
  • 1 POST
Rear lights.
Jul 17, 2021 at 12:27 AM
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SQM
  • Experienced Mechanic
  • 6,383 POSTS
Hello,

Is your turn signal still functional?
You could have some type of wiring issue.
Have checked to see if your flasher relay functional?
You might have to check the wires to see if there is any type of issues with them.

https://youtu.be/Hlna_kUt7As

https://www.2carpros.com/articles/turn-signals-blink-rapidly

I have attached the complete wiring for the hazard and lights.

Let me know if you have any questions.

Thank you.
Jul 17, 2021 at 4:30 AM
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GENE COXIE
  • MEMBER
  • 1 POST
I have replaced every fuse relay and the switch and still nothing and really don't know how to read the schematics for wiring.
Jul 19, 2021 at 1:21 AM
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SQM
  • Experienced Mechanic
  • 6,383 POSTS
Hello,

Since you have replaced just about all the parts and still nothing it is more than likely a wiring issue.
Finding a bad wire in a car wiring harness often requires testing with a volt ohm meter.
It does take a little bit of time to getting used to. Knowing where to look and what to look for is critical.

Here are few helpful articles that might point you to the right direction. It covers the basics of checking a circuit and best practices.

https://www.2carpros.com/articles/how-a-car-electrical-system-works
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

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

Hope this helps.

Thank you.
Jul 19, 2021 at 2:23 AM
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