Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 24Get this manual
Secondary Coil Removal and Installation Remove and install secondary coil (a) as shown IMPORTANT: Coil must be grounded to engine thru the mounting bolts
INSTALLATION
1I nstall primary coil to stator plate with screws as shownMake sure ground wire (e) is fastened with coil mounting screw2Route wire lead below breaker points and fasten to bottom side of stator plate with clamp (c) 3Apply drop of Loctite Type "A" to threads of stator plate mounting screws and reinstall stator plate