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running lights go out when I press on brake

installed new trailer lights, and if I have the running lights on the car on, and press on the brakes all the lights go off on the trailer until I let off the brake

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Hi,

Check that there is a good earth (ground) connection between the vehicle and the trailer.

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I would also make sure the lights have a good ground connection to trailer frame and the pigtail (4 or 6 pin) also has a good ground connection to trailer frame.

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rex will be eternally grateful.
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