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Cruise Control Issue

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Having an issue with the cruise control on my 2007 F150. I've narrowed the issue/problem down to whenever I'm pulling my trailer/wheeler and turn the headlights on the cruise will not engage when set. I've tried without the trailer and it works just fine. Strange issue/problem!

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Sounds like it may be back feeding current into the brake light circuit. Could be caused by a poor ground where the running lights are trying to ground through the brake/signal light circuit, or even as simple as a bulb with the brake filament broken and touching the running light filament.

Do all the lights work properly on the trailer?

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