Ignition Coil Test

Step 7 - Because these terminals are small in size, sometimes a paperclip or small wire can be inserted into the connector terminals which makes testing easier.

Use a Paper Clip

Step 8 - After cutting the paperclip or wire, insert a piece into each terminal, do not allow the wires to contact each other, this could cause damage to the computer.

Wire Inserted Into Connector

Step 9 - Once both terminals have been prepared, use a voltmeter set to the DC voltage setting. Also install alligator clips to the leads to ensure a good connection.

Voltmeter Set to DC Voltage

Step 10 - Next, using the voltmeter lead clips, attach them to the paperclip wires, polarity doesn't need to be observed. (Note: Do not allow the leads to connect during the test.)

Voltmeter Leads Connected

Step 11 - After connecting the leads, turn the ignition key to the "ON" position without cranking the engine. The voltage observed should be 0.

Zero Voltage


Written by
Co-Founder and CEO of
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2015-01-11)