1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 51Get this manual
9Check pinion teeth for chips, cracks or excessive wear
11OhIT) test the brush holderThe positive (+) brushes should not show continuity to brush holderReplace brush holder assembly if ohm test shows continuity
aPinion Gear
BRUSH HOLDER
10Inspect brushes for wearReplace brush holder if not within specifications
aPositive (+) BrushesBrush Holder Assembly