Trailer Connectors
From YourSpec Automotive Wiring Wiki
Trailer Connectors are a standardized set of connectors dictated by the SAE J1239 and J2863 standards.

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The 4 position flat trailer plug is commonly used on small utility and boat trailers without brakes. | ||
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The 5 position flat trailer plug is commonly used on small utility and boat trailer without brakes and with reversing lights. |
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