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NGK Spark Plugs (UK) Ltd has a full time staff of Technical, Sales and Support Personnel at its Head Office in Hemel Hempstead as well as an external Sales Team covering all parts of the UK. For postal enquiries our Head Office addess is:
NGK Spark Plug (UK) Ltd,
Maylands Avenue
Hemel Hempstead
Herts, HP2 4SD
Telephone: 01442 281000
Fax: 01442 281001
A direct measuring of the primary resistance is in many cases not possible.
This is caused by the integrated ignition module, which does not allow to directly access the primary coil.
The connector may look the same, but the signal on the "Signal" wires is different.
These pictures show the difference:
Separate ignition controller
The ignition signal can be measured on "Signal " connectors.
In this configuration, primary resistance can be measured in between each signal wire and battery voltage supply wire.
Integrated ignition controller
At the "Signal1" connectors only the "switch" signal (coming from ECM) can be measured. Resistance of primary coil cannot be checked.
The resistance of the secondary coil can be checked with an ohmmeter. The coil is tested with connectors removed.
Note: Some ignition coils contain diodes to suppress undesired sparks. If diodes are installed, resistance measuring is not possible.
Measurement of secondary resistance:
