8/26/2023 0 Comments Wiring a 7 pin trailer connector![]() Simple fix: gently press a knife blade into the split to expand it and resist the wiggle. In doing so the split brass male section of the plug closed and, being brass, did not spring back thus losing contact with the female section in the socket. After a bit I found that, as the plug is held quite securely in the socket, I was tempted to wiggle the plug from side to side to release it. Right flash stopped working, wiring all OK, connecting screws OK. If your flat trailer connector isn’t working, here’s a great fix from Rick in the comments: The Earth pin (3) is slightly further away from the camera – it is a bit lower than the rest of the pins. Black and blue wires are not connected in the above image as they were not needed for this box trailer with no brakes or aux/reverse. The best! All diagrams are as viewed from the Cable Side. Mandatory disclaimer – I’m a programmer, not an auto electrician, so please check first □ Most images are from Varta – a manufacturer of plugs, sockets and adapters sold in Australia. So every rectangular socket in Australia is compatible with every rectangular plug! On the other hand, flat connectors have only one possible pinout in Australia, one possible orientation (they aren’t half rotated), and the extended 12 pin version is even compatible with the 7 pin one. Plus to top it all off, sometimes the small 7 pin round is rotated so that the yellow pin is at the top! Queensland prefers the small 7 pin round, and apparently Victorians prefer a large 7 pin round that has a completely different pinout! There is also a heavy duty 7 pin round, which is different again! Why? Oh Why? And you can chuck in a couple of older 5 and 6 pin round connectors as well just to make it more confusing (I don’t think they are still in use, so I haven’t put them here). Why? Well first of all, which round one? There are at least 3 different 7 pin round connectors in use in Australia right now. If you have a round connector, commiserations. I put this here because I had a hard time finding and figuring this out for my trailers. The rubber caps just hold the water in.Here’s the wiring diagrams showing the pin out for the plug and socket for the most common circle and rectangle trailer connections in use in Australia. All you need is a thin layer of anything (and grease is cheap and sticky) to keep the oxygen (from the air or water) from getting to the copper. It happens when you combine oxygen with copper. Put grease on your trailer plug, (just plain damn grease). (at night, when you step on the brakes, all the trailer lights go out) -see line one, above Trailer Plug Maintenance If your brake lights work, OR your marker lights work, but everything quits when you turn on both at the same time, your trailer is not grounded to the truck. the "brake light" works on the trailer, the truck just tells then when to flash or not. Still only one light on each side, so if your turn signals work, but not the brakes lights, it is your truck, not the trailer. It's just when they are "on but not flashing", it is assumed to mean brake light. Remember, Trailers DO NOT have "Brake" lights, they have only left and right turn. (add up your load, what could items run at once- example, all lights + brakes) Typically if you have 2 or more brake axles, lots of lights, and use the 12 volt AUX feed to power items, or charge a battery. 30 amps, for those extreme applications, bigger trailers or campers with big loads. 12 Ga, 20 amps, 3 axle brake wire, typical ground wire size, also, 12 volt AUX feed.14 Ga, 15 amps, Lights and up to 2 axle brakes (4 wheels, max).You can not have too many grounds! Make sure your ground wire (typically white) is securely attached to the frame on both the truck and trailer side, preferably at more than one location on the frame! The ground wire should be large enough to handle all the load, do not depend on grounding through the ball. 7 Way Wiring Diagram Other Notes About Trailer Wiring:
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