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What are Two Standard 7-Way Wiring Color Diagrams  

Question:

DOES RED WIRE SUBSTITUTE FOR A BLACK WIRE

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Expert Reply:

For trailer 7-ways there are two wiring color standards that are commonly seen. I attached a picture that shows the difference. Typically red and black are not interchanged though. Sometimes red and yellow are for left turn/stop signal.

That said not all people will use standard trailer wiring colors so you might have non standard colors used.

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Jameson C
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