Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 51Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 51

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IGNITION SYSTEM
NOTE: High tension cables must have spark plug cap removed before testingCap contains 5k ohm resistorIMPORTANT: To remove spark plug cap from high tension leads, turn cap counter