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Spark Test

  1. Using an ohmmeter, check resistance of each spark plug wire. See HIGH TENSION WIRE RESISTANCE table. Check for a strong Blue spark at coil wire and each spark plug wire by holding wire terminal 5/16" ground while cranking engine.
  2. Disconnect and inspect all related ignition system connectors and harness. Clean or repair as necessary. If okay, remove negative battery cable. Disconnect secondary lead from coil Remove primary leads from ignition coil.
  3. Using ohmmeter, check resistance between primary terminals of coil. Check secondary resistance between coil secondary terminal and primary positive terminal. Replace coil if readings are not within specifications. See IGNITION COIL RESISTANCE table.
HIGH TENSION WIRE RESISTANCE

Application Ohms
Fox
Coil Wire With Connectors 1600-2400
Spark Plug Wire With Connectors 4800-7200
Spark Plug Connector 4000-6000
Suppressor 800-1200
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