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Wire Installation Tips

6 & 7-Way Connector Wiring Guide | Trailer Wiring Diagram

Electrical Wiring Location Guide

Wire Installation Tips

By law, trailer lighting must be connected into the tow vehicle's wiring system to provide the trailer running lights, turn signals and brake lights. This is accomplished by tapping into the tow vehicle's electrical harness to transfer power to the trailer wiring system. Connectors are used between the two to allow disengagement when not towing.


Various styles of connectors are available with four to seven pins to allow transfer for the lighting as well as auxiliary functions such as electric trailer brake control, backup lights etc. Choose a connector that had the required number of pins for the functions required. The male end is mounted on the vehicle side the female on the trailer side.

4-Way Connectors

Flat, molded connectors are available allowing basic hookup of the three lighting functions and ground. Flat 4-way plugs can be permanently mounted directly onto all trailer hitches by use of mount part number 18144. This provides a clean installation and avoids the potential problems associated with leaving a plug dangling from the rear of the towing vehicle.

6-Way Connectors

Round 1-1/4" diameter metal connectors are available that allow 1 to 2 additional functions such as back up lights and electric brakes.

7-Way Connectors

Additional pins for auxiliary power, trailer battery charging etc. are available using large 2" diameter, round connectors. Typically these are needed for larger trailers and can be mounted directly in the bracket mounted on every Class III, IV and V hitch.

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