4-78 673831-Rev A
ELECTRICAL
4
1. Measure the brush length (1) with a vernier caliper.
Is the brush length less than 0.33 in. (8.4 mm)?
YES Replace the brush.
NO Continue with step 2.
2. Make sure that the brushes (2) moves smoothly.
3. Check the brushes for visible damage. Replace the
brush(es) if required.
Alternator Rectifier Inspection
Figure 4-68: Rectifier Inspection
1. Check for continuity between battery terminal (1) and
the four stator lead posts (2). Reverse the tester
leads and check for continuity again.
Is continuity indicated in one direction and not
the other
YES Continue with Step 2.
NO One or more positive bridge diodes are bad.
Replace the rectifier.
2. Check for continuity between mounting holes (3) and
the four stator lead posts (2). Reverse the tester
leads and check for continuity again.
Is continuity indicated in one direction and not
the other
YES The rectifier is good.
NO One or more negative bridge diodes are bad.
Replace the rectifier.
Alternator Voltage Regulator Inspection
Figure 4-69: Voltage Regulator Inspection
1. Check for continuity between B terminal (1) and the F
terminal(2). Reverse the tester leads and check for
continuity again.
Is continuity indicated in one direction and not
the other
YES The voltage regulator is good.
NO The voltage regulator is bad. Replace the
voltage regulator.
Starter Motor
Removal and Installation
See Figure 4-70.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Raise the hood.
3. Disconnect the negative (–) battery cable at the
battery.
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