E4040 Mackay 2830 Dunbier 7 Pin Large Round Trailer Plug Vic & SA Skin Pack | Marine Trailer Part
E4040 Mackay 2830 Dunbier 7 Pin Large Round Trailer Plug Vic & SA Skin Pack | Marine Trailer Part
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🔧 Product Description
Mackay 7-Pin Large Round Plastic Trailer Plug – Victoria/SA Pattern – Part Number: E4040
A large round seven-pin trailer plug for connecting the trailer electrical loom to the tow vehicle. The terminal layout carries the standard road-lighting circuits and, on the 12-pin version, additional auxiliary power or control circuits.
⚙️ Key Features
- Colour-coded wiring screws
- Clear inspection panel
- Plastic weather-resistant body
- Skin-pack retail packaging
📏 Specifications
- Connector type: large round seven-pin trailer plug
- Matching connection: Victoria and South Australia wiring pattern
- Dunbier reference: 2830
- Wire gauge and circuit loading must match the terminal capacity
- Pin assignment must follow the vehicle and trailer wiring standard in use
🔄 Cross Reference & Related Parts
- Mackay: E4040
- Dunbier: 2830
- Use only a matching plug and socket pattern
- Adapters are available for some 7-pin formats but do not create missing auxiliary circuits
🚤 Trailer Compatibility & Application
- Suitable for boat and general trailers using the specified connector pattern
- The large-round Victorian/SA pattern is not wired identically to every seven-pin round connector
- Twelve-pin auxiliary circuits must be fused and cable-sized separately
🔌 Function
Provides a detachable electrical connection for trailer lamps, brakes and authorised auxiliary circuits.
⚠️ Common Signs of Failure
- Pins are bent, burnt or corroded
- Housing is cracked or cover is missing
- Terminal screws loosen repeatedly
- Trailer lamps work intermittently when the plug is moved
- Heat damage indicates an overloaded or poor connection
🛠️ Installation & Safety
- Disconnect the battery or relevant supply before wiring
- Follow the correct pin diagram rather than wire colour alone
- Strip conductors cleanly and prevent loose strands
- Provide cable strain relief and weather sealing
- Test every circuit after assembly
📦 Condition
- Brand new Mackay trailer component
- Supplied as one large round seven-pin trailer plug
- Supplied in original or equivalent packaging
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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