Twelve Volt (12/24v) Trailer, Caravan & Motorcar Tow Light Tester
The Best Trailer Tester in South Africa
How To Wire Your Vehicle Wiring
IMPORTANT: Before beginning installation, check your vehicle's owner's manual or
the service manual to familiarize yourself with
the wiring of the rear lights and also if your vehicle comes out with an electronic
tow control unit (E.T.C.U).
If your vehicle does come out with an electronic tow module, then it means that all
your tow socket wiring must work through this module and you cannot connect the wiring
directly to your vehicle rear lights. Contact your nearest dealer or any tow-bar
installation shop to obtain the electrical tow socket wiring kit that works with
Follow the instructions that comes with your electrical tow socket wiring kit and
connect the wiring as according to the SABS standard. After installation please check
that both your vehicle and trailer or caravan lights are all work correctly and that
each light circuit can handle the required amperage/load. Our vehicle and trailer
testers can do all these tests the easy way.
Tow Socket/Plug Wiring Instructions
Use 7 core wire (8 mm gauge) socket/plug South Africa.
1) Yellow-Left Indicator
4) Green-Right Indicator
5) Brown-Right Tail Lamps and Number Plate
6) Red - Stop Lamps
7) Black - Left Tail Lamp and Number Plate
Note. Pins 5 and 7 are normally bridged on older vehicles, trailers and caravans
The Earth - Common Return - (No 3 – white)
The tow hitch of the caravan or trailer must be on the tow bar of the vehicle so
as to create an efficient earth connection. Terminal
no 3 (white) has a wire connected at the socket so as to ensure that the trailer/caravan
is also connected, and this wire must
be connected to the chassis of the towing vehicle as well.
The Spare/Fridge. (No 2 – Blue) is used to connect the fridge. A 15 amp fuse connector
should be connected as a safety precaution. It is recommended that if you do not
feel happy doing it yourself it is then better get a tow bar/trailer specialist to
undertake this operation.
Female tow electrical socket 5-pin or 7-pin
Male tow electrical plug 5-pin or 7-pin
Click link below if you want to see how it is done -