INTERNATIONAL ISO

STANDARD 1185

Third edition
2003-10-15

Road vehicles — Connectors for the

electrical connection of towing and towed
vehicles — 7-pole connector type 24 N
(normal) for vehicles with 24 V nominal
supply voltage
iTeh STANDARD
Véhicules routiers —PREVIEW
Connecteurs pour liaisons électriques entre
véhicules tracteurs et véhicules tractés — Connecteur à 7 contacts de
(standards.iteh.ai)
type 24 N (normal) pour les véhicules à tension nominale de 24 V

ISO 1185:2003
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94d36d2f12e7/iso-1185-2003

Reference number
ISO 1185:2003(E)

© ISO 2003
ISO 1185:2003(E)

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 ISO 1185:2003(E)

Contents Page

Foreword ............................................................................................................................................................ iv
1 Scope...................................................................................................................................................... 1
2 Normative references ........................................................................................................................... 1
3 Terms and definitions........................................................................................................................... 1
4 Dimensions ............................................................................................................................................ 1
5 Application of the connector ............................................................................................................... 4
6 Tests and requirements........................................................................................................................ 5
Bibliography ....................................................................................................................................................... 8

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ISO 1185:2003
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ISO 1185:2003(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 1185 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical
and electronic equipment.
iTeh STANDARD PREVIEW
This third edition cancels and replaces the second edition (ISO 1185:1997), which has been technically
revised. (standards.iteh.ai)
ISO 1185:2003
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iv © ISO 2003 — All rights reserved

INTERNATIONAL STANDARD ISO 1185:2003(E)

Road vehicles — Connectors for the electrical connection of

towing and towed vehicles — 7-pole connector type 24 N
(normal) for vehicles with 24 V nominal supply voltage

1 Scope
This International Standard specifies the dimensions of, and gives particular requirements for, 7-pole
connectors of type 24 N and their contact allocation for the electrical connection of towing and towed vehicles
with 24 V nominal supply voltage, thus ensuring interchangeability.

NOTE For new developments and where more than 7 poles are required, as an alternative to the use of the 7-pole
connector in accordance with this International Standard and ISO 3731, the use of the 15-pole connector in accordance
with ISO 12098 [1] may be required.

2 Normative references
iTeh STANDARD PREVIEW
The following referenced documents are indispensable for application of this document. For dated references,
(standards.iteh.ai)
only the edition cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
ISO 1185:2003
ISO 3731, Road vehicles — Connectors for the electrical connection of towing and towed vehicles — 7-pole
https://standards.iteh.ai/catalog/standards/sist/3531bb76-8c93-4c9c-86a4-
connector type 24 S (supplementary) for vehicles with 24 V nominal supply voltage
94d36d2f12e7/iso-1185-2003
ISO 4009, Commercial vehicles — Location of electrical and pneumatic connections between towing vehicles
and trailers

ISO 4091:2003, Road vehicles — Connectors for the electrical connection of towing and towed vehicles —
Definitions, tests and requirements

ISO 4141 (all parts), Road vehicles — Multi-core connecting cables

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4091 apply.

4 Dimensions

4.1 General

Details not specified are at the manufacturer’s discretion.

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ISO 1185:2003(E)

4.2 Plug

Dimensions shall be in accordance with Figure 1.

The plug shall have six spring tubes, numbered 2 to 7, corresponding to Pin Nos. 2 to 7 of the socket, and one
large spring tube, No. 1, corresponding to Pin No. 1 of the socket.

Dimensions in millimetres

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a Reference plane.
b Locking collar.
c Handle downwards or to right and left, at the discretion of the manufacturer.
d Pitch circle diameter.
e Rear view of the terminals.

Figure 1 — Plug

2 © ISO 2003 — All rights reserved

 ISO 1185:2003(E)

4.3 Socket

Dimensions shall be in accordance with Figure 2. The socket shall have six pins, numbered 2 to 7, and one
larger pin, No. 1.

Dimensions in millimetres

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a Cover drawn in the open position.

b Contact No. 1.
c Pitch circle diameter.
d Reference plane.
e Position of the cover with plug introduced.
f Locking lug.
g Sealing ring.

Figure 2 — Socket

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ISO 1185:2003(E)

5 Application of the connector

5.1 General

The coiled cable assembly is fitted to the semi-trailer towing vehicle (fifth wheel tractor) and may be connected
to the electrical on-board network of the towing vehicle with or without the connection (see Figure 3).

The uncoiled cable assembly is fitted to the drawbar trailer. Therefore, the trailer towing vehicle (drawbar
tractor) shall be fitted with a socket mounted at the rear of the vehicle (see Figure 3).

iTeh STANDARD PREVIEW

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ISO 1185:2003
Key
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1 socket 94d36d2f12e7/iso-1185-2003
2 park socket
3 plug
a See 5.1.

Figure 3 — Electrical connection positions

5.2 Distinguishing marking

The 24 N connectors shall be distinguished from 24 S connectors (see ISO 3731) by means of a different
colouring of at least the insulating parts. A dark and permanent colour, preferably black, shall be used for the
24 N connector.

5.3 Connector positions and free space

The positions of, and free space around, the connectors shall be in accordance with ISO 4009.

5.4 Contact allocation

The allocation of the seven contacts shall be in accordance with Table 1.

4 © ISO 2003 — All rights reserved

 ISO 1185:2003(E)

Table 1 — Contact allocation

Core insulation colour

Contact No. Function
(for information)
1 Common return White
Left-hand rear position and marker lights, and rear
2 Black
registration plate illumination device a
3 Left-hand direction indicator light Yellow
4 Stop lights Red
5 Right-hand direction indicator light Green
Right-hand rear position and marker lights, and rear
6 Brown
registration plate illumination device a
7 Braking control for trailers Blue
a The rear registration plate illumination device shall be connected such that no lamp of the device has a common connection to both
contacts 2 and 6.

5.5 Contact designation

The contact designation numbers shall be permanently marked on the inside of the socket cover, and on the
terminal faces of both plug and socket.
iTeh STANDARD PREVIEW
The character size shall not be less than 2 mm. However, where limited space is available, a smaller size may
be used on the terminal face. (standards.iteh.ai)
5.6 Terminals ISO 1185:2003
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The terminals at the rear side of the pins 94d36d2f12e7/iso-1185-2003
and tubes shall be capable of accepting cables with the following
nominal cross-sectional areas.

 Contact No. 1: 2,5 mm2.

 Contact Nos. 2 to 7: 1,5 mm2.

5.7 Connecting cable

The connecting cable shall meet the requirements of the applicable parts of ISO 4141.

5.8 Protection of disconnected plug

A means of storing the plug when disconnected shall be provided on the vehicle or vehicles, intended to
protect the plug from the ingress of water or foreign bodies and from accidental damage.

6 Tests and requirements

6.1 General

Connectors in accordance with this International Standard shall be tested in the sequences given in Table 2;
for test procedures, see ISO 4091. They shall meet the requirements of ISO 4091, except where this is
specified differently in the following subclauses.

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