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TRAILER WIRING GUIDE







4 Way Connector





White = Ground
Brown = Tail lights
Yellow = Left turn
Green = Right turn

If you are trying to wire a car/truck that has separate turn and brake lights to a trailer where they are one piece you are going to need an Converter. These are sold at most parts stores for around 10-20 bucks






6 Way Connector

The wiring code for the 6-way connector is shown below. This is most commonly used on popup campers with brakes,horse trailers, stock trailers, and utility trailers.

Also notice that the center (A) terminal is not the brake terminal nor the ground terminal. The center terminal is listed as an auxiliary terminal and is used for either backup lights or a 12 volt (+) wire.

I recommend that this terminal be wired for 12 volt (+) for charging the breakaway switch battery. Breakaway switches are now pretty much required on most trailers with electric brakes and a charged battery is required for proper operation.

If you are trying to wire a car/truck that has separate turn and brake lights to a trailer where they are one piece you are going to need an Converter.They are sold at most parts stores for around 10-20 bucks

Wiring diagram
marked color function
1. Brown= Tail Lights
2. White= Ground
3. Yellow= Left Turn
4. Green= Right turn
5. Blue= Electric Brakes
6. Black or Red= 12V
NOTE: center terminal is 6








7 Way Connector

Pictured below is the 7 way connector, which is the connector style in most common use on RV trailers and is becoming increasingly popular on horse and utility trailers.

As you can see in the illustration below the back side of the connector body is labeled at each terminal. The labels are listed below with the function assigned to that pin.

On the tow vehicle side wire color alone should not be relied on, always test and match the function to the appropriate terminal.

On the trailer side RV's for the most part are wired to match the connector colors. Any plug that has been changed or extended, along with utility trailers should be tested when replacing for any reason to be sure the function matches the terminal.

It should be noted below that the center terminal is labeled as an auxiliary circuit, most commonly used for backup lights not a ground terminal as many try to make it.

If you are trying to wire a car/truck that has separate turn and brake lights to a trailer where they are one piece you are going to need an Converter.They are sold at most parts stores for around 10-20 bucks


Wiring Code 7 way Truck End

1. Black or Red = 12v
2. Green = Right turn
3. Blue = Electric Brake
4. White = Ground
5. Small Yellow = Left Turn
6. Brown = Running lights
7. Yellow = Auxiliary 12v
NOTE: #7 is the center terminal and currently is most commonly used for backup lights.
Wiring Code 7 way Trailer End
1.Black or Red=12v
2.Green=Right turn
3.Blue=Electric Brake
4.White=Ground
5.Small Yellow=Left Turn
6.Brown=Running lights
7.Yellow=Auxiliary 12v




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CRITTER AND MARYLEE'S CAMPGROUND