Groundsmaster 4300--D Page 5 -- 27 Electrical System
Seat Switch
The s eat switch is normally open and closes when the
operator seat is occupied. This switch is used as an in-
put for the TEC controller. If the traction system or PTO
switch is engaged when the operator raises out of the
seat, the engine will stop. The seat switch is located di-
rectly under the operator seat.
Testing
1. Before disconnecting the seat switch for testing, the
switch and its circuit wiring should be tested as a TEC
controller input with the Diagnostic Display (see Diag-
nostic D isplay in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the seat
switchandcircuitwiringarefunctioningcorrectly,nofur-
ther switch testing is necessary. If, however, the Diag-
nostic D isplay determines that the seat switch and
circuitwiring arenot functioningcorrectly,proceedwith
test procedure.
2. Make sure ignition switch is in the OFF position.
3. Disconnect wire harness electrical connector from
theseat switchelectricallead nearthe operatormanual
tube under the operator seat (Fig. 27).
4. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the switch connector
terminals.
5. With no pressure on the seat, there should be no
continuity (open) between the seat switch terminals.
6. Press directly onto the seat switch through the seat
cushion.Thereshouldbec ontinuity(closed)astheseat
cushion approaches the bottom of its travel.
7. If seat switch is faulty, replace switch (see Operator
Seat Removal in the Service and Repairs section of
Chapter 6 -- Chassis).
8. Iftheseatswitchtestscorrectlyandacircuitproblem
stillexists,checkwire harness(seeElectricalSchemat-
ic and Circuit Drawings in Chapter 8 -- Foldout Draw-
ings).
9. Connect wire harness electrical connector to the
seat switch electrical lead.
1. Seat switch lead 2. Electrical connector
Figure 27
1
2
1. Operator seat
2. Seat switch
3. Screw (2 used)
4. Seat wire harness
Figure 28
2
3
4
1
Electrical
System
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