2. Install the replacement spark plug wires in the proper order. Observe the following:
a. Reinstall the wires in the spark plug wire retainers.
b. Attach the plug wires to the appropriate spark plug and terminal on the coil. Each end should fit securely.
NOTE: Ensure that the high‑tension wire boot does not come loose when pushing the wire into the terminal.
Ignition Coil
Ignition Coil Voltage Test
The ignition coils can be tested with the CDS G3 diagnostic interface tool with harness.
CDS G3 Diagnostic Interface Tool With
Harness
8M0046124
!
WARNING
High voltage is present any time the key is turned on, especially when starting or operating the engine. Do not touch ignition
components or metal test probes and stay clear of spark plug leads when performing live tests.
1. Disconnect the connector from all of the coils.
2. Perform a visual inspection of the pins at the coil and the wires coming to the connector. Look for broken, bent, and
corroded pins at the coil; and loose, broken, or corroded wires at the connector.
3. Use the DMT 2004 digital multimeter to perform a voltage check of the wiring between the ignition coil connector and the
ECM connector. Set the meter to DC volts.
4. Turn the ignition key to the "ON" position. Battery voltage will only be available when the main power relay is active.
DMT 2004 Digital Multimeter
91‑892647A01
NOTE: All 12 VDC power wires for the coils are spliced together. Unless all the coils have failed, the most likely failure
would be at the splice point, connector, or between the connector and the splice point.
5. If battery voltage is not present on the red/yellow wire to the engine ground, there is an open circuit between the splice
point and the red/yellow wire connector.
Waste Spark System
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 4B-5
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