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Home›Repair guides›Measuring Ignition Coil Resistance

Cummins/Onan — Measuring Ignition Coil Resistance

For these Cummins/Onan models: 2400, 3500.

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Before you start

  • A false reading will result if the spark plug cap is not removed.
  • If the resistance is not as specified, replace the ignition coil.

Procedure

  1. Measure the resistance of the primary coil by attaching one ohm-meter lead to the ignition coil's primary lead while touching the other test lead to the iron core.
  2. Measure the resistance of the secondary side of the coil by removing the spark plug cap and touching one test lead to the spark plug lead wire while touching the other test lead to the iron core.

Tools required

  • Ohmmeter

Specs & torque values

  • Primary side resistance value: 0.8-1.0 ohm
  • Secondary side resistance value: 5.9-7.1 K ohm
  • Spark plug cap resistance: 5K (ohm, as printed)

Source: manual:914-0500 Onan 2EGMBB 2.5EGMBG HomeSite Portable Genset Service manual (03-2006).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.