Anderson Plug Chart - Automotive Electrical Designs

Professional Anderson plug supply & installation

Anderson plugs are the most used and popular solution to power charging a trailer, caravan or camper while driving.


Their main purpose is to transfer the power supply to the battery charge system of your towed vehicle (trailer, caravan or camper). Although 12 pin plugs can be fitted for this purpose, we do not recommend it. The power fed to the plug for charging the battery usually exceeds the capability of the 12 pin plug, which can cause the pin to melt, as it is not designed to hold a high charge feed. Anderson plugs are specifically designed to withstand the needed power charge while driving.


Most common Anderson plugs are grey and red and they are the preferred solution for transferring high current power.

Anderson plugs most common sizes: 50 amp, 175 amp, 350 amp. 


If you're considering wiring your trailer, caravan or camper to your vehicle, give us a call or book a trailer plug installation with us today.

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  • Red Anderson plug = electronic stability control
  • Grey Anderson plug = charging the caravan battery
  • 12 pin trailer plug = to run lighting and provide power to the fridge from the towing vehicle.
Anderson Plug Chart - Automotive Electrical Designs

Caravan 12 Pin Trailer Plug

12 pin flat plug and socket diagram

12 pin trailer plugs enable all connections for the 7 pin plug to tow a caravan, plus the ability to wire accessories.

  1. Left-hand turn indicator
  2. Reversing Signal
  3. Earth return
  4. 4. Right-hand turn indicator
  5. Service Brakes
  6. Stop Lamps
  7. Rear Lamps, Clearance and Side Marker Lamps
  8. Battery Charger/Winch
  9. Auxiliaries/Battery Lead
  10. Earth Return
  11. Rear Fog Lamp
  12. Auxiliaries
12 Pin Plug and Socket Cable Entry Diagram

The 12 pin rectangle trailer plug consists of a row of 7 pins and a row of 5 larger pins.


The row of 7 pins transfers electrical power to run the towing vehicle’s lighting system and electrical braking power.

Anderson plug installation to run the vehicle lighting system

The larger pins are used for higher current most common to run power to a 12 volt fridge or to charge a battery system on a towing vehicle (caravan or camper trailer.)

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Latest Anderson Plug Installations

Ultimate Hilux Fit-out: Ready for Work or Travel

Ultimate Hilux Fit-out: Ready for Work, Travel, and Everything in Between

March 5, 2025
This Hilux 4WD fit-out ticks all the boxes in terms of providing reliable power, clear communication on the road, safe towing, and the ability to handle extended trips with a caravan. We installed a dual battery system with Redarc BCDC charger and solar charging capability via Anderson plugs. Towing and radio accessories were added for worry-free extended travels.
Landcruiser Fit-out for Jayco Caravan Holidays

Landcruiser Fit-out for Jayco Caravan Holidays

February 28, 2025
For hassle-free extended camping trips or weekend getaways, check out this LandCruiser fit-out. A simple, clean, and effective power setup for towing a new Jayco caravan. It will help your caravan's systems stay powered on the road, your portable fridge keeps running while you drive, and everything connects with a simple plug-in (no messy wiring or multiple connections).
Dual System Upgrade with Solar Input for 300 Series LandCruiser

Dual System Upgrade with Solar Input for 300 Series LandCruiser

February 27, 2025
Here's a complete towing and power management setup we recently installed, designed for extended trips in your 300 Series LandCruiser, towing a caravan. This fit-out will guarantee reliable power for all your accessories, complete confidence when braking and towing, clear communication all the way, and the ability to camp off-grid for longer.
Ford Ranger Caravan Adventure Fit-out

Ford Ranger Caravan Adventure Fit-out

February 25, 2025
The goal of this Ford Ranger adventure fit-out was to secure constant, reliable battery power for both the vehicle, the towed caravan, and all the gadgets. To guarantee a safe and enjoyable trip, we installed a rear battery system for reliable auxiliary power, Anderson plugs for seamless caravan connection, and convenient rear canopy power sockets for all accessories. Staying in touch is crucial off-road, so we've installed a premium UHF two-way radio and a custom bonnet-mounted bracket antenna for optimal reception. A Safety Dave camera kit was fitted to ensure reliable power connections and easy access to power points in the canopy. Our professional installation always maintains your vehicle's original look.
Ready to Tow: RAM 2500 Complete Plug Install for Caravan

Ready to Tow: RAM 2500 Complete Plug Install for Caravan

February 25, 2025
RAM 2500 fitted with everything needed for hassle-free caravan towing - clean, professional, and ready for action. We've installed a straightforward but comprehensive towing power setup: a 12-pin trailer plug for full connectivity; a red Anderson plug for caravan electronics; grey Anderson plug for fridge power. With this system, all your caravan's systems stay powered, your fridge keeps running while you drive, and everything connects with a simple plug-in.
Weekend Ready: UHF and Power for Your 300 Series

Weekend Ready: UHF, LED and Power for Your 300 Series

February 25, 2025
This installation completed on this 300 Series Landcruiser combined practical communication and power solutions for touring and camping needs. We started with a GME XRS two-way radio installation, featuring an RJ45 pass-through socket. This setup allows you to remove the handpiece when you're not using it, keeping your cabin tidy and your equipment secure. When you need to communicate, simply plug the handset back in and you're ready to go.
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