Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 116Get this manual
39Remove bolts from voltage regulator and remove voltage regulator from exhaust coverRemove 17 bolts from exhaust cover and remove exhaust cover and ignition coils as an assemblyNOTE: Ignition coils may be removed individually by removing boltsNOTE: Rubber mallet may be used to break gasket adhesion between cover and block 40Remove allen screws from stator