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grounding. Almost always an inadequate ground for one or other the light assembly or most commonly the ground between trailer and tow vehicle (tongue ground is not enough) - inadequate ground can work with low current loads and behave as if dead circuit with the higher load of additional lamps.

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Q: Your trailer lights and signals all work until you turn on your vehicle head light when headlights are on and you signal left or right the trailer lights blink as if the hazards are on you checked the?
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