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For a GWM Cannon (2021–2026) or KingKong (2022–2026), a bolt-on tow bar and plug-and-play wiring kit uses the factory chassis holes and tail-light connectors — no drilling, no wire cutting. The key feature to look for is a decoder module: it isolates the trailer load from the vehicle's computer.
That decoder is what stops the Cannon's most common towing complaint — cruise control and reverse sensors cutting out when you plug in a trailer. Choose 7-pin for standard trailers or 13-pin for caravans with extra circuits.
Which Wiring Kit Fits Your Cannon?
Getting the Cannon tow bar wiring right comes down to two things: your variant and your trailer type. Fitment is confirmed for the 2021–2026 GWM Cannon and the 2022–2026 KingKong, using the factory chassis holes so there's no drilling on standard variants.
The Cannon Alpha and XSR are the exceptions — they use different factory wiring, so if you own one of those, confirm a variant-specific solution before ordering. For everyone else, the standard bolt-on kit is a direct fit.
Connector choice depends on your trailer, not just your ute. Both 7-pin flat and 13-pin options exist, and which you need is set by what you're towing — we'll break that down next.
7-Pin vs 13-Pin: Which Connector?
The connector is where most Cannon owners get stuck. Here's the simple version.
| Feature | 7-pin flat | 13-pin |
|---|---|---|
| Best for | Box, boat & camper trailers | Caravans, European-spec trailers |
| Core circuits | Indicators, brake, tail, reverse | All 7-pin circuits + extras |
| Extra circuits | — | Fridge power feed, trailer-presence detection |
| Electric brakes | Add via dedicated pin/controller | Supported |
| Australian use | Most common standard | Growing on caravans |
A 7-pin flat connector covers the vast majority of Australian towing — box trailers, boat trailers and camper trailers without electric brakes. A 13-pin connector adds circuits for a fridge power feed, reverse lights and trailer-presence detection, which is why it's increasingly common on caravans. A kit offering both future-proofs you. The 13-pin ISO standard details exactly which circuit each pin carries if you want to verify a trailer's wiring.
The Cruise Control Problem — and the Fix
This is the single most-reported Cannon towing issue, and it's worth understanding before you buy any wiring: owners find their cruise control cuts out the moment they hook up a trailer — and sometimes even when the adapter is plugged in with no trailer attached.
The cause is how the wiring talks to the Cannon's electrical system. The ute uses a modern CAN-bus multiplex setup where every output — indicators, brake, reverse — is monitored for load. Plugging a basic 13-to-7-pin adapter into the factory 13-pin socket triggers the vehicle's "tow mode," which deliberately disables cruise control and reverse park assist. The problem is that a plain adapter triggers it whenever it's connected, whether you're towing or not.
A basic 13-to-7-pin adapter is the usual culprit. If your cruise control drops out on the highway after a towbar-only install, check whether a plain adapter is in the circuit. The fix is a wiring kit with a proper decoder module that presents a clean, expected load to the vehicle computer — so the Cannon never false-triggers tow mode, and your cruise control and reverse sensors keep working normally.
This is exactly what a decoder-equipped kit solves. By isolating the trailer's electrical load from the vehicle's computer, the decoder lets the Cannon see a normal, expected signal — no false tow-mode, no lost cruise control. It's the difference between a frustrating highway drive and towing that just works.
Will It Affect Your Cannon's Electrics?
Beyond cruise control, a properly designed kit protects the rest of your Cannon's electronics. The decoder module isolates the trailer circuit, so a trailer fault — a blown bulb or a short in the trailer wiring — doesn't feed back into the ute's computer and throw errors.
The module does need a sensible home. Mount it in a dry, protected location, never near wheel arches, underbody areas or anywhere exposed to road spray or pressure washing. Most decoder modules are water-resistant rather than fully waterproof, so a protected mounting point is what keeps them reliable for years.
DIY Fitment: What's Involved?
For a plug-and-play kit, fitment on a standard GWM Cannon is achievable for anyone comfortable working under the rear of a ute — no wire cutting, no drilling of the chassis. Here's the process.
- Confirm variant & build date. Check the build-date plate in the driver's door jamb and confirm your variant (standard Cannon / KingKong). Match it to the kit's stated fitment before you start.
- Mount the tow bar to factory holes. The tow bar bolts to the factory chassis holes — no drilling on the standard Cannon. Torque all mounting bolts to spec and fit the tongue and hitch.
- Connect the plug-and-play harness. Connect the wiring harness into the tail-light circuit using the factory connectors — no wire cutting or splicing. The decoder module isolates the trailer load from the vehicle computer.
- Mount the decoder module safely. Fit the decoder module in a dry, protected location away from wheel arches and road spray. This module is what keeps cruise control and reverse sensors working normally.
- Route the loom & test. Route excess loom up along the chassis rail (not hanging down), secure with UV-stable cable ties every 200-300mm, then test all trailer lights and functions before towing.
Loom routing is where most DIY installs fail: a large loop of excess wiring left hanging below the socket will flex against chassis edges on corrugated tracks or beach sand and chafe through the insulation. Route the excess up and along the chassis rail, secure with UV-stable cable ties every 200–300mm, and keep it clear of the exhaust. Five minutes of tidy routing prevents an electrical fault in the outback.
Choosing the Right Kit
The decision is straightforward once you know your Cannon's details. Confirm your variant (standard Cannon/KingKong vs Alpha/XSR) and build date from the door-jamb plate, then match the connector to your trailer: 7-pin for standard trailers, 13-pin for caravans with extra circuits.
The strongest single feature to prioritise is the decoder module — it's what protects your cruise control, reverse sensors and vehicle computer, and it's the difference between a kit that "works" and one that tows cleanly for years. Our GWM Cannon Tow Bar & Trailer Wiring Kit (7/13-pin with Decoder) is built around exactly this: factory-hole bolt-on, no drilling, decoder-equipped, with both connector options.
You can confirm your Cannon's factory towing specs on GWM Australia's site before planning your setup.
Complete Your Cannon Towing Setup
A tow bar and wiring kit is the foundation — a few extras round out a proper towing and touring build. For front-end protection and recovery points, our GWM Cannon bull bar fitment & recovery guide covers the complementary hardware. And to protect the tub from the gear you're hauling, a GWM Cannon TPE cargo mat keeps the load area clean. Browse the full GWM Cannon range to sort the rest of the build.
GWM Cannon Wiring Kit FAQs
Why does my cruise control stop working when I tow with my Cannon?
This is the most common Cannon towing complaint, and it comes down to the wiring. Using a basic 13-to-7-pin adapter with the factory 13-pin socket triggers 'tow mode' every time it's plugged in — which disables cruise control and reverse sensors, even with no trailer attached. A wiring kit with a proper decoder module isolates the trailer load from the vehicle's computer, so your cruise control and driver aids keep working normally whether you're towing or not.
Do I need a 7-pin or 13-pin connector for my Cannon?
A 7-pin flat connector suits standard box trailers, boat trailers and camper trailers without electric brakes or reverse lights — it's the Australian standard for most setups. A 13-pin connector carries extra circuits for reverse lights, a fridge power feed and trailer-presence detection, common on caravans and European-spec trailers. A kit that offers both (7 and 13-pin) covers you either way.
Can I fit a GWM Cannon tow bar wiring kit myself?
Yes, if it's a plug-and-play kit that uses the factory chassis holes and tail-light connectors — no drilling and no wire cutting. Budget one to two hours for the electrical work for a mechanically confident owner. The key is routing the loom safely (up along the chassis rail, not hanging down) and mounting the decoder module in a dry, protected spot.
Does the wiring kit fit the Cannon Alpha and KingKong?
Kits vary by variant, so always match to your exact model. The tow bar and wiring kit here suits the 2021-2026 GWM Cannon and 2022-2026 KingKong. The Cannon Alpha and XSR use different factory wiring and may need a variant-specific solution — check your build-date plate in the driver's door jamb and confirm fitment before ordering.
Will a tow bar wiring kit void my GWM Cannon warranty?
No, not automatically. Under Australian Consumer Law, fitting an aftermarket accessory doesn't void your whole warranty — GWM would need to prove the accessory directly caused the specific fault claimed. The real risk is a bad install: a harness that lets water into the decoder module or chafes through the loom can cause electrical damage that isn't covered. Fit it properly and keep your records.
Where should I mount the decoder module?
Mount it in a dry, protected location inside the rear of the vehicle or a sheltered spot — never near wheel arches, underbody areas or anywhere exposed to road spray or pressure washing. Most decoder modules are water-resistant, not waterproof, so water reaching the module can cause failure. A protected mounting point keeps the electronics reliable for the long term.
