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I have a 2006 Toyota Corolla hooked to a 4x8 trailer. The car recepticle shows working for all posts. I replaced trailer wiring harness and painted trailer frame. The harness is grounded to trailer tongue, each light is grounded to trailer frame. Nothing works, no electric to any wire when unhooked from lights. I'm sure it's ground related but cannot find it. I have brightened each ground connection. Light ground is from trailer frame to bolt holding light to frame.

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