Die-cast metal 7-pin flat trailer plug on white background, blade pins visible for AS 4177.5 flat socket connection

Elevate Automotive

7 Pin Flat Metal Trailer Plug — Die-Cast AS 4177.5

Name: 7 Pin Flat Metal Trailer Plug — Die-Cast AS 4177.5
Brand: Elevate Automotive
SKU: B4
Price: 12.50 AUD
Availability: InStock

Die-cast metal 7-pin flat trailer plug, AS 4177.5, 15A per pole at 12V, screw terminals.

Format7-pin flat

Current15A/pole · 12V DC

StandardAS 4177.5

$12.50

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Universal fitment7-pin flat (AS 4177.5) trailer-side plug for most light-duty AU trailers

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A die-cast metal 7-pin flat trailer plug that clips into the matching flat socket on the tow vehicle and carries the trailer's tail, stop, turn, reverse and brake circuits in one keyed fitting. Carries 15A per pole at 12V, so it suits most light-duty towing: box trailers, car carriers, boat trailers, horse floats and small caravans wired to the AS 4177.5 flat pattern. Lands onto screw terminals from the rear so you can wire it in with standard trailer cable and tape or solder as you prefer.

The housing is die-cast metal with a cord-grip gland on the rear that clamps onto the trailer loom and keeps strain off the terminals. Inside, seven brass or nickel-plated brass pins take screw terminals from the back so each core lands on its own labelled position. Overall footprint is about 85 by 45mm by 25mm deep, which drops straight into the matching flat metal socket on the tow bar.

Pin 3 is the earth on the AS 4177.5 flat pattern (white wire, not black or green). Wiring pin 2 (black) or pin 4 (green) as earth puts voltage onto a signal line and burns out globes or trailer-plug LEDs. Fuse each supply circuit at the vehicle end, not at the plug, and use at least 2.5mm² cable on the brake and earth cores if the trailer is running electric brakes.

Related in our range

7 Pin Flat Metal Trailer Socket — Die-Cast AS 4177.5

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

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7-Pin Small Round Metal Trailer Plug

$24.00

Die-cast metal body — stands up to road grit and spray
Cord-grip gland — clamps the loom, keeps strain off terminals
15A per pole at 12V — covers tails, brakes, stop and turn
Brass screw terminals — accept standard trailer cable, no crimper needed
AS 4177.5 pattern — matches the common AU 7-pin flat socket

Electrical

Current: 15A/pole

Voltage: 12V DC

Max voltage: 32V DC

Standard: AS 4177.5

ADR: 42/04

Pin count: 7

Dimensions

Length: ~85mm

Width: ~45mm

Depth: ~25mm

Weight: 0.15 kg

Materials

Housing: Die-cast metal

Pins: Brass

Terminals: 7 screw

Cord grip: Rear gland

Length: 85mm

Width: 45mm

Height: 25mm

Weight: 0.15kg

7-pin flat (AS 4177.5) trailer-side plug for most light-duty AU trailers

Fits trailers wired to the 7-pin flat AS 4177.5 pattern: box trailers, car carriers, boat trailers, horse floats, small caravans

Works on 12V DC systems; rated 15A per pole

Not for AS 2513 large-round sockets (use the large round plug)

Not for small round metal sockets (different pin pattern)

Not for ISO 1724 European 7-pin flat; pin 5 is a handbrake sensor on the EU pattern, not AU, and wiring to AU convention damages EU-pattern wiring

Q: What does "7-pin flat" actually mean?
It is the small rectangular Australian trailer plug with seven brass pins in two staggered rows. The flat pattern is the most common one on light-duty trailers (box trailers, car carriers, small boat trailers). "Flat" refers to the physical shape of the pin array, not the plug housing shape.

Q: What is the pin assignment on the AS 4177.5 flat pattern?
Pin 1 (yellow) is the left turn signal; pin 2 (black) is reversing lights; pin 3 (white) is EARTH; pin 4 (green) is the right turn signal; pin 5 (blue) is electric brakes; pin 6 (red) is stop lamps; pin 7 (brown) is tail, clearance and marker lamps. Note that white is earth, not black or green.

Q: How much current can each pin handle?
Rated 15A per pole at 12V. That covers tail and marker lights, stop lamps, turn signals and typical trailer brake controllers. Winches, high-current fridges and inverters do not belong on trailer-connector pins; those need their own Anderson or direct battery feed with a proper fuse.

Q: How is this different from the large round plug?
The large round pattern (AS 2513) uses 7 round pins arranged in a circle and is rated to 30A per pole. The flat pattern (AS 4177.5) uses 7 blade pins and is rated to 15A per pole. The two are physically incompatible; plug and socket must match. The matching large-round plug is here: [7-pin-large-round-metal-trailer-plug].

Q: Can I use this with a European caravan socket?
No. The European ISO 1724 7-pin flat uses the same physical connector but a different pin assignment: pin 5 on ISO 1724 is a handbrake sensor, not electric brakes. Plugging an AU-wired plug into an EU-wired socket (or vice versa) burns out circuits. If the vehicle is wired to ISO 1724, use a 7-to-13-pin EU adaptor or rewire to AU convention.

Q: What size cable should I use?
2.5mm² is the sensible minimum for AU trailer wiring. Earth and brake cores often go up to 4mm² on heavier trailers or long runs. 1mm² is too light for anything beyond short tail and marker runs. Match the cable size to the trailer loom, not just the plug.

Q: Does this fit a trailer with electric brakes?
Yes. Pin 5 on the AS 4177.5 flat pattern carries the brake controller signal through to the trailer brake magnets. Wire pin 5 to the brake wiring through 2.5mm² or 4mm² cable depending on trailer axle count. Use the matching socket on the tow-vehicle end: [flat-trailer-connector-socket-7pin].

Q: How does it attach to the trailer loom?
The cord-grip gland on the rear of the plug clamps onto the sheath of the trailer loom. Strip each core back about 10mm, land it on the matching screw terminal inside, then tighten the gland so no strain reaches the terminals. Add a short loop of slack between the gland and the first fixing point on the drawbar so the plug can flex without the cores pulling out.

Q: Is it weatherproof?
The die-cast housing and cord-grip gland keep road grit and spray off the terminals, and when the plug is in the matching socket the connection sits inside the socket's sprung metal lid. It is not fully sealed to IP67, so submersion is not covered. Boat trailer owners who regularly dunk the plug should use a dedicated waterproof version.

Q: What else might I need?
The matching socket for the tow-vehicle end: [flat-trailer-connector-socket-7pin]. If the tow vehicle is wired to the AS 2513 large round pattern instead, use the [7-pin-large-round-metal-trailer-plug]. For small round pattern vehicles, use the [trailer-connector-7-pin-small-round-plug].

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