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Trailer Wiring Connectors

Most of the wiring connector has 4 to 7 posts or blades, based upon how it has been equipped, to control brake functions and brake lighting. Four wire flat plugs are used in small trailers to control the taillights, turn signals, and brake lights. Five, six and 7 wires are used in larger trailers to control auxiliary power, backup lights, and electric trailer brake control.