2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 106Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 106

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IGNITION
aIgnition Coils The primary (+) side of the ignition coil receives battery voltage from the main power relayWhen the ECM receives signal from the CPS, the main power relay ground circui