TRAILER WIRING DIAGRAMS

TRAILER WIRING DIAGRAMS

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7 PIN ROUND


7 Pin Round plugs come in both large and small. This is the universal wiring you will find on all new trailers.
Your standard trailer generally only has 5 wires and the 2 spare pins (pins 2 & 5) are generally for electric brakes or caravan accessories.
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7 PIN FLAT


7 Pin Flat / square plugs (American Style) are great for newer vehicles and follow the same 1-7 numbering system as the 7 Pin Round plugs.
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12 PIN FLAT


12 Pin Flat plugs are an extended version of the 7 Pin Flat plug. The extra 5 pins are for Caravan or Camper Van accessories.
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5 PIN ROUND


5 Pin Round plugs are becoming less common these days as they are not compatible with the 7 Pin Round. The wiring is similar to a 7 Pin Round and you often see people "daisy chain" their indicators into pins 1 and 4 to suit. I wouldn't recommend using this set up as it is becoming obsolete.
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6 PIN ROUND


6 Pin Round plugs are very rare and are becoming obsolete. I would recommend a 7 pin setup over a 6 pin. 
You see these plugs on a lot of older (1980's) 4WD's
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13 PIN EURO


13 Pin Euro plugs are fairly common on a lot of overseas model vehicles. The 13 pins allow for a lot more accessories to be wired in if needed.  For Australian Trailers, simply wire in the 5 or 7 required wires and leave the rest empty.
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