Primary Coil Resistance
Disconnect the coil leads from the engine harness, and measure the resistance of the primary coil with a DMT 2004 Digital
Multimeter or equivalent.
DMT 2004 Digital Multimeter 91‑892647A01
Meter Test Leads
Meter Scale Reading
Red Black
Orange Black Ω 0.26–0.35 Ω
Secondary Coil Resistance
1.
Remove the spark plug leads from the spark plugs.
2. Measure the resistance between the two high tension leads (spark plug boots).
Meter Test Leads
Meter Scale Reading
Red Black
High tension lead High tension lead Ω 16.8–20.2 kΩ
3. If the reading is other than specified, replace the ignition coil.
Removal
1.
Remove the cable tie that secures the coil input wires.
2. Disconnect the bullet connectors for the orange and black coil input wires.
3. Remove the clips from the upper spark plug wire, and remove the spark plug wires from the spark plugs.
NOTE: It is easiest to remove the wire and boot as a unit from the plug.
Ignition
Page 2A-18 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017
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