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I had a problem once with my 97 Ford F 150 where the brake lights were reversed. On all the time except when I pushed on the pedal on the wires that went to my boat trailer.

It was a simple relay that was fried. Took it to Firestone and there "Master Repairman" said everything was off on the trailer electric connection. I knew that was incorrect because it used to work just fine.

Took it to the Ford dealer and within 20 min diagnosed the problem with a cheap fix of about 30 dollars.

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Q: How do you fix brake lights that don't work when headlight are on but are on when the headlights are off?
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