Why do my trailer lights go out when I hit the brakes?Why do my trailer lights go out when I hit the brakes?

It sounds like you have a ground issue. When trailer lighting does not have a sufficient ground many different scenarios can show up, but the most prevalent is when the most amperage is applied, like tail lights on and brake pedal pressed, the lights go out. All lights must be properly grounded for proper function.Click to see full answer. Hereof, why do my tail lights go out when I hit the brakes?It sounds like you have a bad ground connection. If all ground connections are not making good contact to bare metal, when the brake pedal is pressed and the tail lights are on, the increased amperage draw will make this problem show up.Subsequently, question is, why are my trailer brake lights dim? Strange as it may sound, a loose or rusty/corroded ground can cause a vehicle’s trailer wiring harness to badly misbehave and shut down some functions. It may also just limit the amount of current that can flow to the lights and this will result in dim illumination. Also to know is, how do trailer brake lights work? Running jumper wires from the light grounds to the main trailer connector ground can help. If the wrong bulb is lighting up it is likely just that the turn signal/brake light wire is attached to the tail light running light wire and the running light wire is attached to the trailer turn signal/brake light wire.Why do both trailer lights blink?what causes both signals to blink when you only turn one on? Expert Reply: This is normally related to a bad ground connection somewhere. Make sure the main trailer connector ground and the grounds for each of the lights are all connected to clean and corrosion free bare metal surfaces.

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