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Why Is Trailer Ground Wire Connected To Frame and Cant Vehicle Complete Circuit?

Question:

Why is ground connected to frame? I am fixing up an old trailer with 4-way bonded wire. The white ground wire runs all the way from the connector to the tail lights with all the other wires. Why do instructions in many places say to ground the light and the ground wire to the frame, and this light, for example, has a terminal connector on the white ground wire? It seems like the white wire makes a continuous ground from the vehicle through the lights and completes the circuit. I trust that a whole lot more than terminal connectors screwed to a frame which might rust, etc. Am I missing something?

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Expert Reply:

The Miro-Flex LED Combination Trailer Tail Lights - Submersible - 38 Diodes - Driver and Passenger Side # TLL28RK has a ring terminal to ground the light to the trailer frame. If you want to ground your wiring harness at the same location instead of to the frame you can as the vehicle will ground the light.

The tail lights each have a ground as well as any clearance lights. So if wiring directly to the vehicle each light will need have a jump wire for that direct wiring connection. I recommend just grounding to the trailer frame so you complete that circuit and allow you to ground the lights just to the trailer frame. Most of the time the tail light ground wire is connected to the mounting hardware of the light which is also connected to the frame.

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