# 2837 Dunbier E4043 Mackay 12 Pin Metal Trailer Plug | Marine Trailer Part

🔧 Product Description

  

Dunbier 12-Pin Metal Trailer Plug - Part Number: 2837

  

A trailer-side plug for the Australian 12-pin trailer-connector system. The connector carries lighting, electric-brake and approved auxiliary circuits according to the wiring arrangement used by the towing vehicle and trailer.

  

⚙️ Key Features

  

• Connector format: 12-pin

• Installation role: trailer-side plug

• Metal housing

• Screw-terminal or manufacturer-specified internal connections

• Replacement for damaged, corroded or incompatible trailer connectors

  

📏 Specifications

  

• Pin count: 12

• Format: 12-pin

• Pack style: Skin pack, bulk or loose as stated

• Pin allocation must follow the connector diagram and vehicle wiring

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 2837

• Mackay: E4043

• 7-pin flat pair: Dunbier 2851 plug and 2852 vehicle socket

• Large-round family: Dunbier 2820, 2830, 2831D, 2834 and 2835

• 12-pin pair: Dunbier 2836 vehicle socket and 2837 trailer plug

  

🚤 Trailer Compatibility & Application

  

• Suitable for vehicles and trailers using the 12-pin Australian connector layout

• Large-round pin conventions can vary by state and existing wiring history

• Twelve-pin connectors provide additional auxiliary circuits beyond basic lighting

  

🔌 Function

  

Creates a removable electrical connection between the towing vehicle and trailer for road lighting, brakes and auxiliary functions.

  

Common signs of wear or failure:

  

• Pins are corroded, burnt or loose

• Plug will not retain in the socket

• One or more trailer functions fail

• Housing is cracked or water affected

• Cable clamp no longer provides strain relief

  

🛠️ Installation & Safety

  

• Disconnect the vehicle battery or isolate the circuit before wiring

• Follow the pin diagram rather than wire colour alone

• Tighten terminals securely without cutting conductor strands

• Clamp the outer cable sheath for strain relief

• Test every circuit, including brakes and auxiliaries, before towing

  

📦 Condition

  

• Genuine Dunbier Marine Products part

• Brand new

• Supplied as one trailer-side plug

• Supplied in original or equivalent packaging

## Details

- **Price:** 44.0 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 44.00 AUD | In stock |

## Images

- 2837 Dunbier E4043 Mackay 12 Pin Metal Trailer Plug | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/2837-dunbier-12-pin-metal-trailer-plug-mackay-e4043)
> Updated: 2026-08-05