Mercury Optimax 115 Service Manual page 105

Armature Test for Ground
1. Set ohmmeter to (R x 1 scale). Place one lead of ohmmeter on armature core or shaft
and other lead on commutator.
2. If meter indicates continuity, armature is grounded and must be replaced.
Checking Positive Brushes and Terminal
Set ohmmeter to (R x 1 scale). Connect meter leads between POSITIVE brushes. Meter
must indicate full continuity or zero resistance. If resistance is indicated, inspect lead to
brush and lead to POSITIVE terminal solder connection. If connection cannot be repaired,
brushes must be replaced.
a -
Testing Negative Brushes for Ground
Set ohmmeter to (R x1 scale). Place one lead of the ohmmeter on the NEGATIVE brush
and the other lead on the end cap (bare metal). If the meter indicates NO continuity, re-
place the NEGATIVE brush. Repeat this procedure on the other NEGATIVE brush.
a -
b -
90-855347R1 JANUARY 1999
POSITIVE (+) Brushes
b
a
a
NEGATIVE (–) Brushes
End Cap
a
a
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CHARGING & STARTING SYSTEM
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