ISO 4024:1992

Road vehicles - Ignition coils - Low-tension cable connections

Specifies the dimensions. Applies to ignition systems for spark-ignited internal combustion engines of road vehicles.

Véhicules routiers — Bobines d'allumage — Connexions des câbles à basse tension

General Information

• Status: Published
• Publication Date: 14-Oct-1992
• ICS: 43.060.50 - Electrical and electronic equipment. Control systems
• Technical Committee: ISO/TC 22/SC 32 - Electrical and electronic components and general system aspects
• Drafting Committee: ISO/TC 22/SC 32/WG 1 - Ignition Equipment
• Current Stage: 9093 - International Standard confirmed
• Start Date: 17-Jun-2021
• Completion Date: 13-Dec-2025

Relations

• Revises: ISO 4024:1977 - Road vehicles - Low tension cable connections for ignition coils
• Effective Date: 15-Apr-2008

Overview

ISO 4024:1992 - "Road vehicles - Ignition coils - Low-tension cable connections" specifies the dimensional requirements for low‑tension (low‑voltage) cable terminations used on ignition coils in ignition systems for spark‑ignited internal combustion engines of road vehicles. This second edition replaces ISO 4024:1977 and extends the original requirements to include M6 threaded connections.

Key topics and technical requirements

• Scope: Dimensions for low‑tension cable connections on road‑vehicle ignition coils.
• Terminal types: Defines two main terminal styles:
  • Threaded terminals (recommended thread sizes: M5 for negative polarity; M6 preferred for positive polarity; for dry ignition coils M6 is required for the positive polarity).
  • Blade (quick‑connect) terminals, including 6.3 mm × 0.8 mm tabs (with hole) as illustrated.
• Marking: Positive and negative polarities must be permanently marked with “+” and “−”; characters at least 2 mm high.
• Connection limits: A maximum of two permanent connections per polarity is permitted; multiple‑blade connectors are allowed.
• Manufacturer discretion: Exact terminal positioning is left to the manufacturer, while dimensions and test/acceptance criteria must comply with the standard.
• Referenced test/termination standards: Blade/tab terminations are required to comply with relevant ISO quick‑connect standards (ISO 8092 series) and related test/performance provisions.

Applications and who uses it

• Automotive OEMs and Tier‑1 suppliers use ISO 4024 to standardize ignition coil terminal designs for compatibility across vehicle platforms and harness assemblies.
• Ignition‑coil manufacturers adopt the dimensional and marking rules to ensure interchangeability and correct polarity identification.
• Electrical connector and cable harness suppliers reference the standard to produce mating terminals and quick‑connect fittings that meet automotive requirements.
• Test laboratories and conformity assessors use the dimensional and referenced test standards for quality control and component acceptance.
• Aftermarket parts manufacturers rely on the standard when designing replacement coils and connector kits to ensure fit and safe installation.

Related standards

• ISO 8092‑1 / ISO 8092‑2 - road vehicle quick‑connect terminations (tabs and test/performance requirements)
• ISO 10455 - dry ignition coils used with rotating high‑voltage distributors (referenced in ISO 4024)

ISO 4024:1992 is essential for ensuring mechanical and electrical compatibility of low‑tension connections on ignition coils, improving interchangeability and safety in automotive ignition systems.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD
Second edition
1992-11-01
Road vehicles - Ignition coils - Low-tension
cable connections
V87icules routiers - Bobines d’allumage - Connexions des ciibles SI
basse tension
-- -- ---- --
~_-~
-__------
--- - .~--
-- ---
Reference number
~--
__-_---- -----
ISO 4024: 1992(E)
_. ._ - ___.- -- ---
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The wot-k
of preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been estabiished has the riqht to be
represented on that committee. International organizations,‘ govern-
mental 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 e!ectrotechnicaI standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Fublication as an Inter-
national Standard requires approval by at least 75 % of the membet
bedies casting a vote.
International Standard ISO 4024 was prepared by Technical Committee
ISO/TC 22, Road veliicles, Sub-Committee SC 1, Igrjifiori equiprnenf.
This second ed ition cancels and replaces the first edition
(ISO 4024:1977), which has been extended to include M6 connections.
0 ISO 1992
All righ,ts reserved. No part of this publication may be reproduced or utilized in any ferm
or by any means, electronie or mechanical, including photocopying and microfilm, without
Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
INTERNATIONAL STANDARD ISO 4024:1992(E)
Low-tension cable
Road vehicles - Ignition coils -
connections
ISO 8092-2:1988, Road vehicles - Fiat, quick-connect
1 Scope
fermina Gons - Part 2: Test and Performance re-
quirements for Single pole connections.
This International Standard specifies the dimensions
of low-tension cable connections for ignition coils
iso 10455: -l), Road vehicles - Dry ignition coils us-
used in ignition Systems for spark-ignited internal
ing rotating high-volfage distributor.
combustion engines of road vehicles.
3 Specifications
See
...

NORME Iso
INTERNATIONALE
Deuxième édition
1992-l 1-o 1
Véhicules routiers - Bobines d’allumage -
Connexions des câbles à basse tension
Road vehicles - Ignition coils - Low-tension cable connections
----
-- --
--
Numéro de référence
-.-. -------- ISO 4024: 1992(F)
_.- ._. __.--. . ._- .-_ ---.

Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération
mondiale d’organismes nationaux de normalisation (comités membres
de I’ISO). L’élaboration des Normes internationales est en général
confiée aux comités techniques de I’ISO. Chaque comité membre inté-
ressé par une étude a le droit de faire partie du comité technique créé
à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO participent également aux tra-
vaux. L’ISO collabore étroitement avec la Commission électrotechnique
internationale (CEI) en ce qui concerne la normalisation électrotech-
nique.
Les projets de Normes internationales adoptés par les comités techni-
ques sont soumis aux comités membres pour vote. Leur publication
comme Normes internationales requiert l’approbation de 75 % au moins
des comités membres votants.
La Norme internationale ISO 4024 a été élaborée par le comité techni-
que ISO/TC 22, Véhicules routiers, sous-comité SC 1, Équipement d’ai-
kunage.
Cette deuxième édition annule et remplace la première édition
(ISO 4024:1977), qui a été étendue aux connexions M6.
0 ISO 1992
Droits de reproduction réservés. Aucune partie de cette publication ne peut être repro-
duite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou
mécanique, y compris la photocopie et les microfilms, sans l’accord écrit de l’éditeur.
Organisation internationale de normalisation
Case Postale 56 l CH-1211 Genéve 20 l Suisse
Imprimé en Suisse
ii
NORME INTERNATIONALE
- Bobines d’allumage - Connexions des
Véhicules routiers
câbles à basse tension
ISO 8092-2: 1988, Véhicules routiers - Connexions
1 Domaine d’application
rapides à languette plate - Partie 2: Essais et exi-
gences de performance des connexions pour rac-
La présente Norme internationale prescrit les ca-
cordements unipolaires.
ractéristiques dirnensionnelles des connexions des
câbles à basse tension pour les bobines utilisées
ISO 10455:- ‘), Véhicules routiers - Bobines d’allu-
sur les systèmes d’allumage des moteurs à com-
mage «sèches» utilisant un distributeur haute ten-
bustion interne à allumage par étincelle des véhi-
sion rota tif.
cules routie
...