Trailer Parts Superstore - Trailer Wiring, Plugs & Sockets
Trailer Wiring, Plugs & Sockets
Trailer wiring and harness plugs are available in a variety of sizes and configurations. The most basic of designs is the color coded 4-WIRE system which uses a brown wire for tail, license, and side marker lights, yellow wire for left hand stop and turn, green wire for right hand stop and turn, and white wire for system ground. The "Flat-4" harness plug is found on almost all boat trailers and many smaller utility trailers that do not have brakes.
5-WIRE systems provide all the color coded functions of the 4-pole systems plus an additional blue wire which may be used for Hydraulic disc brakes or auxiliary lights.
6-WIRE systems provide all the color-coded functions of the 4-pole systems plus two additional poles for 12-volt feed (red wire) and suppl (blue wire) to Electric brake systems.
7-WIRE systems provide all the color-coded functions of the 6-pole systems plus an additional pole for interior/exterior lighting. 7-wire systems are most commonly found on RV & Cargo trailers.
Tail Light Converters are necessary for adapting import and domestic vehicles with separate turn and stop lights (3-wire system) to standard trailer tail light wiring (2-wire system). Always consult the vehicle owner's manual when considering trailer wiring.
Click here to see a 4-pole system color coded trailer wiring diagram
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