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Troubleshooting Turn Signal Issues with T-One Wiring Installed on a 2021 Ford Bronco  

Question:

I installed the 118849 kit on my 2021 Ford Bronco. I have found that the left turn signal doesn’t not work on the trailer and the right turn signal puts the 4 ways on. I tested the trailer on 2 other vehicles and all lights work properly.

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Expert Reply:

Since the trailer is working with other vehicles it does sound like the T-One # TK99VR wiring is the issue on your 2021 Ford Bronco.

If you use a circuit tester on the 4-Way you can double check and make sure that the 4-Way is working correctly. I would try the connector as well as the wiring before and after the module to ensure that your Bronco is sending the correct signals through.

If your Bronco is sending everything correctly (like it should be) then I would think that the wiring is the issue and I would take advantage of the 1-year limited warranty.

expert reply by:
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Jon G

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