12 Pin Flat Plastic Trailer Plug — AS 4177.5 — hero shot of nickel-plated brass pins behind hinged dust cover

12 Pin Flat Plastic Trailer Plug — back-of-plug view showing wire-saddle Phillips terminals and cable gland

Elevate Automotive

12 Pin Flat Plastic Trailer Plug — AS 4177.5

Name: 12 Pin Flat Plastic Trailer Plug — AS 4177.5
Brand: Elevate Automotive
SKU: BTC-12P
Price: 29.00 AUD
Availability: InStock

BTC-12P

Plastic 12-pin flat trailer plug that carries lighting, electric brakes, battery charge, aux power and rear fog across 12 circuits to AS 4177.5.

Pin Count12 pins (7+5)

Pin Rating15A sm · 35A lg

StandardAS 4177.5

$29.00

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Universal fitment12-core trailer wiring with electric brakes, aux power or battery charge

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A plastic 12-pin flat plug that extends the standard 7-pin lighting loom with five extra circuits for electric brakes, battery charge, aux power and a rear fog lamp. Carries tail, stop, turn, reverse, park and earth across the small pins and runs electric brakes, battery charge, reverse camera power, auxiliary power and a rear fog lamp across the large pins. Fits caravans with electric brakes, car trailers, large boat trailers and horse floats wired to AS 4177.5.

The housing is one-piece plastic with a hinged dust cover that snaps shut over the pin face. Nickel-plated brass pins drop into wire-saddle terminals clamped by Phillips head screws so each core gets a firm mechanical bite. The cable gland at the back accepts a 12-core trailer cable and the strain relief holds the loom clear of the pins.

Match pin assignment to AS 4177.5 at both ends; mixing colours between pin 2 (reverse) and pin 5 (brakes) is the most common wiring mistake and shows up as reverse lights coming on with the brake pedal. The large pins carry up to 35A each at 12V and the small lighting pins carry up to 15A each, so run electric brake and battery charge circuits in 2.5mm² cable and keep winches, large inverters and anything above 35A off the connector entirely.

Related in our range

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12 circuits — lights plus brakes, aux, battery charge and rear fog
15A / 35A — small lighting pins and large aux pins separately rated
AS 4177.5 — AU standard pin assignment, mix-and-match with any 12-pin flat socket
Dust cover — hinged cap keeps dirt and water spray off the pin face
Wire saddles — Phillips-screw terminals clamp each cable core for a firm bite

Electrical

Pin count | 12 pins (7+5)

Small-pin rating | 15A at 12V

Large-pin rating | 35A at 12V

Voltage | 12V DC nominal

Standard | AS 4177.5-2004

ADR | 42/04

Dimensions

Overall length | 120mm

Face width | 55mm

Face height | 35mm

Weight | 260g

Materials

Housing | Moulded plastic

Pins | Nickel-plated brass

Terminals | Wire-saddle Phillips

Cover | Hinged dust cap

Length: 110mm

Width: 190mm

Height: 50mm

12-core trailer wiring with electric brakes, aux power or battery charge

Caravans with electric brakes and 12V battery charge

Car trailers wired to AS 4177.5 12-pin flat

Large boat trailers, horse floats and heavy box trailers

7-pin flat sockets; use the matching 7-pin flat plug instead

7-pin small or large round sockets; use a round-pin plug

ISO 11446 13-pin euro sockets; not pin-compatible

Q: What's the difference between a 7-pin and a 12-pin flat trailer plug?
A: A 7-pin flat carries the six lighting circuits plus earth. A 12-pin flat carries those same seven plus five extra large pins for electric brakes, battery charge, auxiliary power, reverse camera power and a rear fog lamp. If the trailer only has tail/stop/turn/reverse lights, the 7-pin flat is enough. The moment electric brakes or a fridge comes into it, go 12-pin. See [flat-trailer-connector-plug-7pin] for the 7-pin equivalent.

Q: What does AS 4177.5 actually mean?
A: AS 4177.5-2004 is the Australian/New Zealand standard that locks in which pin on a 12-pin flat connector carries which circuit, so a plug from one manufacturer wires straight into a socket from another. ADR 42/04 is the design rule that references it. If both ends are AS 4177.5 the pin colours and functions line up.

Q: What are the pin ratings?
A: The seven small lighting pins carry 15A each at 12V. The five large pins (electric brakes, battery charge, aux, reverse camera, rear fog) carry 35A each at 12V. Keep each circuit sized to the pin it runs on and fuse at the source.

Q: Can I run a winch or a big inverter through this plug?
A: No. A 12-pin flat connector tops out at 35A per large pin. Winches draw 200-500A under load and large inverters pull 200A plus at 12V. Those circuits need their own dedicated feed through an Anderson plug or a bolt-down connection, not through a trailer plug.

Q: Which socket does this plug mate with?
A: Any AS 4177.5 12-pin flat trailer socket. See [flat-trailer-connector-socket-12pin] for the matching socket we sell. It will not mate with 7-pin flat, 7-pin round or ISO 11446 13-pin euro sockets.

Q: What cable do I use with it?
A: 12-core trailer cable. The six lighting cores can run in 1.5mm² or 2.5mm²; the five large circuits (brakes, battery charge, aux) should run in 2.5mm² minimum to keep voltage drop and heat under control. The gland at the back of the plug accepts a standard 12-core sheath.

Q: How does the pin assignment go?
A: Pin 1 left indicator (yellow), pin 2 reverse (black), pin 3 earth (white), pin 4 right indicator (green), pin 5 service brakes (blue), pin 6 stop (red), pin 7 tail/park (brown), pin 8 battery charge/winch (orange), pin 9 aux/battery lead (pink), pin 10 earth return (white), pin 11 rear fog (grey), pin 12 auxiliaries (purple). Follow this at both ends and the trailer wires straight through.

Q: Why do my reverse lights come on with the brake pedal?
A: Classic wiring mistake — pin 2 (reverse) and pin 5 (brakes) have been swapped at one end. Pop both plugs, check the colour-to-pin assignment against the table above, and move the stray wire to the correct terminal.

Q: Does the hinged dust cover seal it against water?
A: The cover keeps dirt, grit and road spray off the pin face when the plug is disconnected and sitting in a holster. It isn't an IP-rated seal. Leaving a bare plug trailing in standing water or jet-washing it with the cover shut will still push moisture into the pins; coil the lead up when the trailer isn't hooked up.

Q: Is this plug a genuine Baxters/Narva product?
A: It's an Elevate Automotive 12-pin plastic plug built to AS 4177.5. We buy the housing through the Baxters supply chain, QC-check it on receipt and sell it under our own brand with our own warranty. Pin assignment is identical to any other AS 4177.5 12-pin flat, so it mix-and-matches with Narva, Britax and any other brand socket.

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