7 Pin Large Round Metal Trailer Socket — Die-Cast AS2513

Q: What does "large round 7 pin" mean?
A: It's the Australian trailer-connector family that uses seven brass pins arranged in a circle inside a metal or plastic body roughly 55mm across. "Large" refers to the bigger of the two round body sizes; the small round is about 35mm across the face. Caravans, box trailers, horse floats and most 4WD setups run the large round pattern.

Q: What is AS2513?
A: AS2513 is the Australian Standard that sets pin positions and wire colours for 7 pin round trailer connectors in Australia. Pin 1 left turn (yellow), pin 2 reversing (black), pin 3 ground (white), pin 4 right turn (green), pin 5 electric brake (blue), pin 6 stop (red), pin 7 tail (brown). The pattern differs from international ISO 1724 on pin 5, which carries brakes here instead of reversing.

Q: Will this fit a 7 pin small round plug?
A: No. The large round body is physically bigger than the small round and the pins sit on a different circle. Use the matching large round plug for this socket, or the small round socket if the trailer already runs a small round plug.

Q: Will this fit a flat trailer plug?
A: No. The flat 7 pin and flat 12 pin connectors are a different family entirely. Use a flat socket for a flat plug, or an adaptor to cross between the two families.

Q: My trailer was wired in Europe. Will this work?
A: Not without rewiring pin 5. The AS2513 pattern puts electric brake control on pin 5; the European ISO 1724 pattern puts reversing lamps there. Plug a European-wired trailer in on the AS2513 side and tail-light operation can activate the brake controller instead. Check and relabel pin 5 before plugging anything in.

Q: How do I wire this socket?
A: Pull the back cover off, pass the seven cores through the cable gland and screw each one down to its labelled terminal: 1 yellow, 2 black, 3 white, 4 green, 5 blue, 6 red, 7 brown. The terminals are internal screws, so a short-shaft Phillips or flat driver that fits inside the housing is needed. No crimper required.

Q: Is this socket waterproof?
A: Weather resistant, not sealed. The spring lid shuts over the contacts when nothing is plugged in and keeps dust and splash out, but it is not IP rated. Mount it where it is not sitting in standing water and keep the lid closed when not in use.

Q: What's the per-pin current rating?
A: 30A per pole at 12V DC under AS2513. That carries tail, stop, turn and electric-brake loads at normal trailer currents. For a dedicated battery-charging feed to a caravan house battery running a fridge and lights, run that on an Anderson plug on its own circuit rather than through a pin on this socket.

Q: How do I keep the contacts clean?
A: Once a year, pull the plug out, wipe the pins with a clean rag and run a thin film of dielectric grease on them. If the pins look green or crusty, scrub them with a brass brush first. The lid takes care of most dust; the grease stops moisture building a resistance film on the contact faces.

Q: What plug matches this socket?
A: The matching plug is below.
[7-pin-large-round-metal-trailer-plug]