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78/83/90 Series Horizontal Shaft Engines
78
Charging system testing
To test the charging system:
1. Locate the charger harness. It will be by the right
handle bar of the snow thrower when the engine is
installed.
See Figure 6.16.
2. Start the engine and run it at full throttle.
3. Connect the black (-) lead of a digital multimeter to a
good ground on the engine.
4. Set the multimeter to read AC voltage.
5. Back probe the yellow wire in the charger harness
with the red (+) lead of the multimeter.
See Figure 6.17.
6. The multimeter should read a voltage of 13 - 18Vac.
7. Set the multimeter read DC voltage.
8. Back probe the red wire of the charger harness.
See Figure 6.18.
9. The multimeter should read 17 - 26Vdc.
10. If the results do not match what is listed above,
check the magnets on the rotor.
NOTE: If the magnet are still magnetic, replace the
stator.
Figure 6.16
Charger
harness
Figure 6.17
Charger harness
Yellow wire
Figure 6.18
Red wire
For Parts Call 606-678-9623 or 606-561-4983
www.mymowerparts.com