Symbol guide

Example	Description
	Socket
	Pin

A number of standards prevail in Australia for trailer connectors, the electrical connectors between vehicles and the trailers they tow that provide a means of control for the trailers.

The Australian market uses its own version of especially the European contacts, but also completely own contacts.^[1][2]

The only connector used on the Australian market that is fully ISO standard conformant is the 7-pin ABS / EBS plug.

Since Australia has vehicles from both the North American market and the European market there is a mixture of 12V and 24V.

7-pin trailer connector (AS 4735) for heavy duty vehicles[edit]

This connector is based on both SAE J560 and ISO 1185 and is providing either 12V, 7 x 40A or 24V, 7 x 20A. The voltage varies from vehicle to vehicle.

#	DIN	Signal	Color	Rec. cross-section		Notes
				mm²	AWG
1	31	Ground (-)	White	10	8
2	58 or 58L	Clearance lamps/Outline marker lamps, Side marker lamps, identification lamps	Black	4	12
3	L	Left Turn Signal	Yellow	4	12
4	54	Stop lamps	Red	6	10
5	R	Right Turn Signal	Green	4	12
6	58 or 58R	Tail lamps, registration plate lamp	Brown	4	12
7		Reversing lamps or +12V via ignition lock	Blue	6	10

Round trailer connectors Type 1[edit]

These connectors are based on ISO 1724 in 5-pin and 7-pin versions, but with some difference in the wiring.

Round 7-pin trailer connector Type 1 (AS 2513)[edit]

This contact has chosen to use one of the connections of the ISO 1724 is used for position light to electric brakes (Pin 5, 58R), which means that if you connect a trailer with electric brakes to a towing vehicle wired according to ISO 1724 and turn on the position lights the trailer will be braking. Pin 2 (54G) is in the Australian wiring standard the reversing light, which is a minor problem.

#	DIN	Signal	Color	Rec. cross-section		Notes
				mm²	AWG
1	L	Left Turn Signal	Yellow	1.5	15
2		Reversing lamps, control current to block surge brakes when reversing.	Black	1.5	15
3	31	Ground connected to chassis	White	2.5	13
4	R	Right Turn Signal	Green	1.5	15
5		Electric brake control	Blue	1.5	15
6	54	Stop lamps	Red	1.5	15
7	58	Tail lamps, clearance lamps/outline marker lamps and registration plate lamp left side	Brown	1.5	15

Round 5-pin trailer connector Type 1[edit]

This connector is replaced by the 7-pin (AS 2513), but can be found on older vehicles. Note that pins 1 and 4 missing. Pin placement is identical to the 7-pin ISO 1724 with the absence of these pins. This means that you can connect a trailer with a 5-pin connector to a 7-pin socket or the other way around, but since the pins are wired in a different way the result may be far from what was expected.

#	DIN	Signal	Color	Rec. cross-section		Notes
				mm²	AWG
2	L	Left Turn Signal	Yellow	1.5	15
3	31	Ground	White	2.5	13
5	R	Right Turn Signal	Green	1.5	15
6	54	Stop lamps	Red	1.5	15
7	58	Tail lamps, clearance lamps/outline marker lamps and registration plate lamp	Brown	1.5	15

Round trailer socket type 2[edit]

Round 7 pin trailer connector type 2[edit]

#	DIN	Signal	Color	Rec. cross-section		Notes
				mm²	AWG
1	L	Left Turn Signal	Yellow	1.5	15
2		Reversing lamps	Pink	1.5	15
3	31	Ground	White	2.5	13
4	R	Right Turn Signal	Green	1.5	15
5		Electric brake control	Blue	1.5	15
6	54	Stop lamps	Red	1.5	15
7	58	Tail lamps, clearance lamps/outline marker lamps and registration plate lamp	Brown	1.5	15

Round 6-pin trailer connector type 2[edit]

#	DIN	Signal	Color	Rec. cross-section		Notes
				mm²	AWG
1	58	Tail lamps, clearance lamps/outline marker lamps and registration plate lamp right side	Brown	1.5	15
2	L	Left Turn Signal	Yellow	1.5	15
3	R	Right Turn Signal	Green	1.5	15
4	54	Stop lamps	Red	1.5	15
5		Electric brake control	Blue	1.5	15
6	31	Ground (-) for pin 1 – 8	White	2.5	13

Rectangular trailer connectors Type 3[edit]

#	DIN	Signal	Color	Rec. cross-section		Notes
				mm²	AWG
1	L	Left Turn Signal	Yellow	1.5	15
2		Reversing lamps, control current to block surge brakes when reversing.	Black	1.5	15
3	31	Ground	White	2.5	13
4	R	Right Turn Signal	Green	1.5	15
5		Electric brake control	Blue	1.5	15
6	54	Stop lamps	Red	1.5	15
7	58	Tail lamps, clearance lamps/outline marker lamps and registration plate lamp	Brown	1.5	15
8	30	+12V permanent	Orange	2.5	13
9	15	+12V via ignition lock	Pink	2.5	13
10	31	Ground	White	2.5	13
11		Rear fog lamps	Grey	1.5	15
12		Spare	Purple	2.5	13

The image of the 7 and 12 pin flat plugs are from the cable entry view (and possibly the images of the round connectors too). Please see reference [2] (VSB1 section 14) for front image. Reference [1] Narva wiring diagrams also have the diagrams cable entry view. If you want the front view images in colour see ^[3]

References[edit]