Taillights do not work when headlights are turned on

109,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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SPARKY77
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  • 1 POST
Ice or water got in a connection some place I think? Fuses are good? Short or connection problem? What is best place to start trouble shooting?
Feb 28, 2019 at 7:08 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,676 POSTS
I would start with the tail light relay or combination switch. Here is a guide to help you get started with the tail light wiring diagrams so you can see how the system works:

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

and

https://www.2carpros.com/articles/no-tail-lights-exterior-running-lights-tail-lights-out

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Mar 2, 2019 at 4:19 AM
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