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7 Electrical System Service
Component Tests
N. Seat Switch Safety Interlock Test
Check the seat switch (B, Figure 49) with the following
tests.
Engine should shut off if:
A. Operator rises off seat with the brake pedal NOT
depressed.
B. Operator rises off seat with electric clutch
engaged.
C. Operator rises off seat with cruise control lever
engaged.
Figure 50. Test Seat Switch
O. Seat Switch Test
See Figure 50.
The liquid-cooled and diesel engine models have a N.O.
(normally open) seat switch. When the seat is unoccu-
pied, the switch is open and will not conduct current.
Sitting in the seat closes the switch.
The air-cooled engine models have a N.C. (normally
closed) seat switch. When the seat is unoccupied, the
switch is closed and will conduct current. Sitting in the
seat opens the switch.
1. Tilt the seat forward and pull the wire harness off the
back of the switch.
2. Set VOM to Ohm. With the switch at rest (no operator
pushing down on the seat) probe the switch termi-
nals. The VOM should show no continuity (open) for
liquid-cooled engine models and continuity (zero
ohm) for air-cooled engine models.
3. Press down in the middle of the seat to activate the
switch.
4. Probe the switch terminals. The VOM should show
continuity (zero ohm) for liquid-cooled engine models
and no continuity (open) for air-cooled engine mod-
els.
5. Replace a switch that does not pass all tests.
Figure 49. Seat Switch Safety System
A. Seat C. Cruise Control Lever
B. Seat Switch
B
C
A
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