Headlights turn off when using turn signals

180,000 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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LBOYER
  • MEMBER
  • 2 POSTS
The truck listed above XLT, the headlights function well, but cut off when using turn signal. Can occasionally get them to come back on by moving turn signal. What do I need to check?
Jun 4, 2022 at 11:13 PM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
More than likely this is a turn signal switch issue.

So, let's start by checking this and go from there.

Basically, we need to check the voltage coming out of the switch when this is happening.

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

I suspect you will not find the voltage unless you move it around which means the multifunction switch needs to be replaced.

I am attaching the headlight and turn signal wiring diagrams so that you can test the switch.

This is pretty common, so I suspect this is what you are going to find so I am attaching the process to replace the switch as well.

Please let us know what you find.

Thanks
Jun 6, 2022 at 12:07 AM
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LBOYER
  • MEMBER
  • 2 POSTS
Replaced the turn signal switch, problem solved! Thanks!
Jun 11, 2022 at 11:47 PM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
That is great. I am so glad that this is fixed. However, I am even more glad that you came back to update us with what the fix was.

Thanks again and please come back in the future.
Jun 12, 2022 at 4:13 AM
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