What is a trailer female plug?
A trailer female plug (also called a socket) is the connector mounted on the vehicle side, designed to receive the trailer’s male plug and supply power to its lights and electrical systems.
What type of plug is this?
This is typically a 7-pin flat female socket, the most common towing connection used across New Zealand for trailers, caravans, and boat trailers.
What does a 7-pin female socket do?
It provides electrical connections for key trailer functions, including:
- Indicators (left and right)
- Brake lights
- Tail lights
- Earth (ground)
- Auxiliary power (depending on wiring setup)
Is this compatible with all trailers?
Most NZ trailers use a 7-pin flat plug, making it widely compatible. However, some setups use round or 12-pin connectors, which may require an adaptor.
Where is the female plug installed?
The female socket is typically mounted on the tow vehicle, near the towbar, allowing the trailer plug to connect easily.
Can I install it myself?
Yes, if you have basic wiring knowledge. The socket uses standard colour-coded wiring and screw terminals, but correct wiring is essential for safe operation.
What tools are required for installation?
You’ll usually need:
- Screwdriver
- Wire stripper
- Crimping tool (optional)
- Mounting screws or bolts
What is the power rating?
Most 7-pin sockets are rated around 12V with 15–20A capacity, suitable for standard trailer lighting circuits.
What materials is it made from?
They are generally made from durable plastic housings with brass or nickel-plated terminals, ensuring good conductivity and resistance to corrosion.
Can this be used for caravans?
Yes, it’s suitable for caravans, campers, boat trailers, and general trailers, provided the wiring matches the trailer plug.
Do I need an adaptor?
You may need an adaptor if:
- Your trailer uses a different connector type (e.g., round or 12-pin)
- Your vehicle and trailer have mismatched plug styles
What are the common trailer socket types?
- 7-pin flat (most common in NZ)
- 7-pin round (older or heavy-duty setups)
- 12-pin flat (for additional power circuits)
