1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 88Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 88

CHARGING AND STARTING SYSTEM
TESTING ARMATURE FOR GROUND
1Use an ohmmeter (R 100) to check for no continuity between commutator and armature core or commutator and shaft2If continuity exists, armature is grounded and must be replaced