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Connecting a box trailer, boat trailer, horse float or caravan? Start with the socket fitted to your ute and the plug on the trailer. Pin count, connector format and working circuits all matter; choosing by the Cannon badge alone can leave you with the wrong adapter.
Which trailer plug does your GWM Cannon need?
Open the socket cover and identify the connector before shopping. Record your Cannon’s model year, build date, exact variant and towing equipment. Dealer-fitted or aftermarket wiring may differ from the setup shown in another owner’s photo.
The plug already matches
Keep the connection if it supplies the trailer’s required functions and meets the applicable requirements. Working lamps alone do not confirm that electric brakes or caravan power are connected.
The plug does not match
Identify both ends and their circuits. Then compare an appropriate adapter with a properly specified socket conversion; neither option should be chosen from pin count alone.
Check GWM Australia’s Cannon accessories catalogue and confirm the fitted equipment with your dealer or installer. It does not establish one factory socket specification for every Cannon year and variant. Cannon Alpha fitment also needs its own confirmation.
7-pin vs 13-pin: compare the actual formats
“7-pin vs 13-pin” is incomplete unless the connector format is named. Australian 7-pin flat, European 7-pin round and European 13-pin round are different systems. An Australian 12-pin flat connection is another option when the caravan needs additional circuits.
| Format | What to check | Buying implication |
|---|---|---|
| Australian 7-pin flat | Matching flat housing and documented Australian circuit allocation | Confirm lamps, earth and service-brake circuit where required |
| Australian 7-pin round | Exact small-round or large-round format and terminal mapping | Choose the corresponding socket or specifically mapped adapter |
| European 13-pin round | Identified connector standard and the vehicle’s wired functions | A 13-to-7-pin flat adapter must specify the Australian trailer end |
| Australian 12-pin flat | Basic circuits plus the caravan’s documented auxiliary requirements | Verify extra feeds, returns, fusing and loads |
| Other EU or US formats | Connector identification and circuit documentation | Do not substitute them for Australian flat based on contact count |
Swipe the table sideways on a small screen.
The ISO 11446-1 standard defines dimensions, contact allocation and tests for a 13-pole 12V connector. That standard does not prove which circuits your particular Cannon supplies, or that a European connector alone meets the requirements for your Australian trailer.
For applicable Australian light-trailer connections, ADR 42/05, section 21 references AS 4177.5-2004. Check the actual connector and installation against the relevant requirements; fitting parts together is only one part of the job.
7-pin flat vs round: identify the connector first
Flat and round describe connector formats, not an automatic upgrade in function. Small round and large round are distinct, and a European round connector is not interchangeable with an Australian one simply because both have seven contacts.
Check the housing, keying, terminal labels and the supplier’s viewing-direction diagram. A front mating-face view and a rear wiring view can look reversed. For terminal identification, see our Australian 7-pin flat pinout and wiring checks.
If both ends already use a suitable matching format, changing from round to flat is not automatically necessary. Choose secure engagement, suitable sealing and cable retention; connector shape alone does not establish corrosion resistance or reliability.
Can you use a 13-pin to 7-pin flat adapter?
Yes, where the adapter is specified for the actual vehicle socket, trailer plug and required circuits. If your Cannon has a European 13-pin socket and your trailer has Australian 7-pin flat, request that exact direction and format. A European 13-to-7-pin round adapter is a different item.
- Identify both ends: photograph the vehicle socket and trailer plug, including labels and contact count.
- Specify the direction: European 13-pin vehicle socket to Australian 7-pin flat trailer plug, if that is your setup.
- Confirm circuit mapping: check lamps, earth and any required electric-brake output; do not assume “seven pins” covers them.
- Check mechanical fit: secure the adapter and lead while allowing coupling movement, without dragging or tension.
- Test with the trailer: check individual and combined lamp functions and commission the brake system to its instructions.
Trailer detection, parking sensors and trailer-sway functions depend on the vehicle and wiring system. Confirm any required activation, coding or adapter features with GWM or the installer. Extra contacts alone do not prove how these functions work, and a passive adapter does not establish that they are retained or disabled.
Adapter or permanent socket conversion?
Consider an adapter
Useful when a correctly mapped, compatible adapter supplies every required function. It can preserve the existing socket, but adds connections to inspect, secure and protect.
Consider a socket conversion
Useful when frequent towing favours a direct connection, or vehicle-side wiring needs work. Have the installer confirm the socket, vehicle connectors, circuits and any setup requirements before modifying the loom.
Check the actual cost and supplied parts rather than comparing a generic adapter price with a product’s lowest advertised variant. A socket change, complete vehicle harness and mechanical towbar are different jobs.
Neither option fixes damaged wiring or guarantees freedom from dashboard warnings. Check connections under operating load and investigate faults before towing. A CAN module’s presence is not proof of vehicle-specific function retention.
Electric brakes, caravan power and 12-pin plugs
On the Australian 7-pin flat allocation, electric service brakes use Pin 5. Pin 3 is earth return and Pin 6 operates the stop lamps. Do not confuse brake lights with the separate circuit that controls the trailer’s brakes.
| Terminal | Assigned circuit | Check separately |
|---|---|---|
| Pin 3 — white | Earth return | A suitable return conductor; not the tow coupling |
| Pin 5 — blue | Service brakes, where fitted | Compatible brake control and active output |
| Pin 6 — red | Stop lamps | Lamp operation; not proof that electric brakes work |
Swipe the table sideways on a small screen.
Source: VSB1 Revision 6, August 2026, page 48. These assignments apply to the Australian connection discussed here; do not transfer them to an unidentified overseas plug.
Electric brakes do not require a 12-pin plug solely because they are electric. The trailer still needs a compatible control system and properly installed wiring. A 13-to-7-pin lighting adapter must not be assumed to provide that brake output.
For a caravan fridge or battery system, follow the caravan maker’s circuit schedule. VSB1 recommends reserving Pin 5 for service brakes and using a 12-pin connector where auxiliary circuits are needed. Additional terminals still need suitable feeds, returns and protection.
Adding a 12-pin or 13-pin socket does not automatically provide battery charging or camera video. Confirm the equipment’s actual power and connection requirements with the installer before choosing the connector.
Which parts are relevant to your setup?
A plug mismatch may need an appropriate adapter or connector rather than a complete towbar. Start with the electrical job and confirm fitment before choosing a product. The following listings are relevant enquiries, with different purposes.
Vehicle-side wiring needs work?
Enquire about the vehicle-specific trailer wiring harness if wiring needs to be added or replaced. Its “Vehicle-Specific” option requires your year, model and pin type; Cannon Australian fitment must be confirmed.
Request the supplied socket format, connectors, instructions and supported functions. Select a confirmed Cannon configuration rather than a BYD or Tesla variant.
Confirm Cannon wiring fitment
Trailer needs electric-brake control?
The proportional electric brake controller is a separate enquiry when your trailer’s brakes require compatible control. A lighting harness or adapter does not replace it.
Have the installer confirm the Cannon, actual brake type, controller instructions and socket output. Do not treat “all 12V vehicles” as approval for your exact setup.
View controller details
Mechanical towbar also required?
The GWM Cannon towbar and wiring product page has separate mechanical and electrical choices. A towbar does not resolve a socket-format mismatch by itself.
Current wiring choices include European and American formats. Confirm the exact Australian connector and vehicle fitment before selecting a wiring option.
Review towbar and wiring optionsBrowse GWM Cannon accessories after identifying the required job. Check the selected variant, included parts, current price and displayed currency on its product page.
Fitment checks before ordering or towing
- Vehicle: exact Cannon or Cannon Alpha model, year, build date, VIN and towing equipment.
- Connectors: photos of the vehicle socket and trailer plug, including labels and mating faces.
- Functions: lamps, brake-system needs and any documented caravan auxiliary circuits.
- Parts: correct adapter direction or socket kit, written fitment and installation instructions.
- Commissioning: connection security, wiring protection, required functions and the equipment’s test procedure.
Keep wiring clear of heat, sharp edges and moving parts, with a suitable earth return independent of the coupling. Follow the exact component instructions for fusing, cable sizes, mounting and testing; a figure from another kit is not transferable.
Check any dashboard warning or unexpected behaviour with the installer before towing. Cannon and Cannon Alpha documentation, build dates and connector appearance do not establish universal cross-fitment.
GWM Cannon trailer plug FAQ
Does the GWM Cannon have a 7-pin or 13-pin trailer socket?
Inspect the socket fitted to your vehicle and confirm its model year, variant and tow package. The official sources reviewed do not establish one connector for every Cannon. Dealer-fitted or aftermarket wiring may also differ.
Can I connect a 7-pin flat trailer to a 13-pin Cannon socket?
If the vehicle socket is identified as European 13-pin, use an adapter specified for that socket and an Australian 7-pin flat trailer plug. Confirm every required circuit; a generic European 13-to-7-pin round adapter is a different product.
Which way round should I specify the adapter?
Describe the vehicle-side socket and trailer-side plug explicitly, and send photos of both. For the setup discussed here, request European 13-pin vehicle socket to Australian 7-pin flat trailer plug. Avoid ordering by ambiguous male/female wording alone.
Is a 7-pin round plug the same as 7-pin flat?
No. Identify the exact round format, including small round or large round where applicable, and its circuit mapping. The two formats do not connect directly; contact count alone does not establish compatibility.
Will a 13-to-7-pin adapter operate electric trailer brakes?
Only if the vehicle has a compatible brake-control output and the specific adapter routes it correctly to the trailer. Working lamps do not prove brake operation. On Australian 7-pin flat, the service-brake circuit is Pin 5.
Is Pin 3 the electric-brake output on Australian 7-pin flat?
No. Pin 3 is earth return, Pin 5 is service brakes where fitted, and Pin 6 operates the stop lamps. Follow the identified connector’s labelled diagram and viewing direction; do not use this allocation for an overseas plug.
Will an adapter affect trailer-sway control or parking sensors?
Confirm the behaviour for the exact vehicle, tow package and adapter with GWM or the installer. Pin count alone does not establish trailer detection, activation or coding requirements. Do not assume an adapter either retains or disables these functions.
Do Cannon and Cannon Alpha adapters and harnesses cross-fit?
Do not assume universal cross-fitment. Confirm the exact model, build date, socket and vehicle connectors against written fitment information. Similar-looking sockets or a listing for one model do not establish compatibility with the other.
When should I choose an Australian 12-pin plug?
Consider it when the caravan needs documented auxiliary circuits beyond the standard seven. Confirm supplies, returns, fusing and equipment loads. VSB1 recommends using Pin 5 only for service brakes and preferring 12-pin where auxiliary circuits are required.
Is a permanent harness better than an adapter?
Choose according to the required functions, verified fitment and how you tow. A suitable adapter may preserve the current socket; a properly specified conversion may provide a direct connection. Neither guarantees a cure for faulty wiring or dashboard warnings.
Can I fit a plug-and-play harness without cutting wires?
That depends on the supplied kit and the vehicle’s connectors. Obtain the exact fitting instructions and written Cannon fitment before ordering. A generic plug-and-play description does not establish a no-cut installation for every model.
Related reading: GWM Cannon Australian 7-pin flat pinout and wiring checks. Use that guide for the detailed terminal table and viewing direction.
