Please note that because of interchangeability problems that may arise, it is recommended that pin number 5 in the 7 pin connectors be used only for service brakes. For reference - a Type 3 connector is the flat variety and this comes in 7 pin and 12 pin. Both Type 1 and 2 plugs have a locating notch at the bottom. The larger round Type 1, 7 pin plug seems to be quite popular in Victoria. Type 1 is the large 7 pin connector type with a PCD (Pitch Centre Diameter) of 20mm, whilst Type 2 is the small 7 pin connector type with a PCD of 13mm. There is a large and small variety of this plug and socket type. More information can be found on the Australian Government's - Department of Infrastructure, Transport, Regional Development and Local Government website. This applies to all types of trailer plugs used in Australia. Also, an important thing to remember - it is the WHITE wire that is the earth in trailer wiring not the green or black wires. Knowing these colour codes can save you the time consuming exercise of testing lights by means of trial and error. The following diagrams and bullet points provide the Australian Standard for 5 and 7 pin plugs and sockets for trailers and caravans. ![]() Well, we are not going to go too in depth with all these types - only the more commonly used ones. As mentioned above, there are a number of connectors from 5 pin round, 6 pin round, 7 pin round small, 7 pin round large, 7 pin heavy duty, 7 pin flat, and even a 12 pin flat - phew!! and not to mention all the adapters available, it can all be quite confusing. ![]() Trailer wiring can be difficult to get your head around. Although there are some people who have the aptitude to test trailer, camper and caravan lights, diagnose faults, and even fix them - this article does not intend to be a replacement for an auto electrician (which is a trade), and instead should only be used as a guide. There quite a few types out there, and some types are more predominantly used depending on the state you live in. ![]() When purchasing a tow bar wiring harness you can get either a universal kit or a customised kit.This article will provide some tips for trailer wiring, showing you the various plugs and sockets used in Australia. If you have had a tow-ball retrofitted to your car then you will also need to install a tow bar wiring harness kit which will then allow you to hook up the trailer signals to the car electronics system using a trailer plug. Tow Bar Wiring Harness Kit for Retrofitted Tow Bars If you don’t have the correct shaped trailer plug then you will need a trailer adaptor plug in order to connect the trailer lights and signals to your car. However, some trailers may come with a 7 pin flat trailer plug, which will not match up to a round connection point. The most commonly seen trailer plug is a 7 pin trailer plug with a round connection point. This is an important safety feature when towing a trailer. ![]() Basically, this means that if you indicate left in your car, the trailers left indicator will also blink simultaneously. If you are towing a trailer then you will need a trailer plug to ensure the trailer light wiring is connected to your cars electronic signals.
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