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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 not possible in many cases because the integrated ignition module does not allow to directly access the primary coil.
The connector may look the same, but the signal on the "Signal 1" wire is different. This pictures show the difference:
Separate ignition module (controller): Ignition signal can be measured on "Signal 1" (Trig) connector.
In this configuration, primary resistance can be measured and secondary circuit can be checked indirectly by measuring the primary signal between control unit and Coil with an oscilloscope.
Integrated ignition module (controller): On the "Signal1" connector only the "switch" signal can be measured. Primary coil cannot be checked.
Measurement of secondary resistance:
Note: Some ignition coils contain diodes to suppress unwanted sparks. If diodes are installed, resistance measuring is not possible.
