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Brake Lamps of Flat Towed 2018 Ford F-150 Cancelling Out Turn Signals

Question:

Turn signals on truck don’t work when brake lights are on. All else works fine. Is this normal?Hopkins hm56009 on 2018 f150

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Expert Reply:

For some vehicles, like your F-150, when the flat towing wiring is installed, the brake lamps will override the turn signals. To prevent this from happening, you'll need to install a brake light relay, like the # RM-88400 offered by Roadmaster.

I've linked to installation instructions as well as to an install video that you'll likely find helpful.

expert reply by:
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Mike L

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