DIAGNOSTICS ELECTRICAL
3/5/97 4 - 17
CHARGING CIRCUIT DIAGNOSIS
NOTE: Be sure to set multimeter to read AC or DC voltage or amperage as test requires:
Test Conditions:
• Brake engaged, blade drive lever disengaged • Engine running at fast idle (3600 rpm)
• Engine connector disconnected • Meter negative (–) lead on battery negative (–) terminal
• Ignition switch in run position • Meter positive (+) lead on numbered test point
Test/Check Point Normal If Not Normal
1. Engine connector 451 Yel/Blk
wire
Unregulated voltage 14 VAC See Briggs & Stratton engine
manual for charging system repair
2. Engine connector 220 Red/Blk
wire
2–4 Amps DC See Briggs & Stratton engine
manual for charging system repair
3. Headlamps Remain on with engine running Go to step 4
4. Headlamp connector 451 Yel/
Wht connector at engine cover
11.8-13.2 DC voltage
Check headlamp bulbs
See Briggs & Stratton engine
manual for charging system repair
Test Conditions:
• Meter negative (—) lead grounded to engine frame • Stop engine
• Meter positive (+) lead on numbered test point • Disconnect engine connector
Test/Check Point Normal If Not Normal
5. Engine connector wires:
Red Wire
Black wire
Infinite resistance from wire to ground
Infinite resistance from wire to wire
Check stator for short to ground
Check stator for internal short
See Briggs & Stratton manual
Test Conditions:
• Reconnect engine connector • Start engine • Multimeter negative to ground
Test/Check Point
6. Plug in fuse 11.8-13.2 DC volts (both sides of fuse) Check 220 Red/Blk circuit
7. Red wire at ignition switch 11.8-13.2 DC volts Check 220 Red circuit
8. Battery positive terminal 11.8-13.2 DC volts Check 201 Red Battery Positive
lead and terminal connector
www.servicemanualall.com
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