Mercury F5FZ-12029-A Coil Assembly - Ignition

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To remove the coil on non-supercharged models, disconnect the battery's negative terminal cable, detach the coil's electrical connectors, and remove the coil and bracket bolts. Reverse these steps for installation. For supercharged models, disconnect the battery's negative terminal cable, disconnect the coil pack's electrical connector, and remove the spark plug wires and the coil pack screws. Reinstall by reversing these steps.

Mark wires and terminals with numbered tape for breaker points ignition systems. Remove primary wires and high-tension wire from the coil, then remove and clean the coil assembly. Check for cracks or damage and clean any corrosion. Use an ohmmeter to check coil primary and secondary resistance, replacing the coil if resistances don't match specifications. Reinstall the coil and reconnect wires. For breakerless systems, disconnect wires and measure resistance across coil primary terminals, replacing the coil if necessary. For EDIS systems, disconnect electrical connectors from the coil and check resistance between coil primary terminal and outer terminal. Replace the coil if resistances don't match specifications. To replace the coil, disconnect the negative cable from the battery and ignition coil electrical connectors, remove the bolts securing the ignition coil, and install the new coil.

To remove the coil on non-supercharged models, disconnect the battery's negative terminal cable, detach the coil's electrical connectors, and remove the coil and bracket bolts. Reverse these steps for installation. For supercharged models, disconnect the battery's negative terminal cable, disconnect the coil pack's electrical connector, and remove the spark plug wires and the coil pack screws. Reinstall by reversing these steps.

When it has been determined that a coil needs replacement in the COP system, unplug the coil, remove the retaining bolt, and remove the coil.

Start by marking the wires and terminals with numbered tape. Then, remove the primary wires and high-tension wire from the coil. Take out the coil assembly and clean the outer case, checking for cracks or damage. Inspect the coil primary terminals and the coil tower terminal for corrosion, cleaning with a wire brush if necessary.