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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
Some U4 category coils have a two-pin primary connector (Example U4002). In this case the resistance of the primary coil can be measured in between these two pins.
Most coils of the U4 category are equipped with integrated ignition modules (controllers). Therefore, in this case the primary resistance cannot be measured. On the "Signal1" connector only the "switch" signal coming from the engine control module can be measured.
Note: Some ignition coils like NGK U4009 contain diodes to suppress unwanted sparks. If diodes are installed, resistance measuring is not possible.
