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Groundsmaster 5900/5910Page 5 -- 42Electrical System
Increment/Decrement Switch
The increment/decrement switch is used as an input for
the engine control module to raise or lower the engine
speed in small amounts. When the switch is depressed
and held in the forward position, the engine speed will
increase. Conversely, when the rear of the switch is de-
pressed, engine speed will decrease. The increment/
decrement switch is located on the steering tower (Fig.
75).
Testing
1. Before disconnecting the increment/decrement
switch for testing, the switch and its circuit wiring should
be tested as a TEC controller input with the Info Center
Diagnostic Display (see Info Center Display in this sec-
tion).
2. If the Diagnostic Display verifies that the increment/
decrement switch and circuit wiring are functioning cor-
rectly, no further switch testing is necessary.
3. If the Diagnostic Display determines that the incre-
ment/decrement switch and circuit w iring are not func-
tioning correctly, test increment/decrement switch.
4. Make sure ignition switch is OFF. Remove key from
ignition switch.
5. Remove front steering tower cover (see Steering
Tower Disassembly in the Service and Repairs section
of Chapter 7 -- Chassis). Locate increment/decrement
switch and unplug wire harness connector from switch.
6. The switch terminals are marked as shown in Figure
76. The circuit logic of the increment/decrement switch
is shown in the chart to the right. With the use of a multi-
meter (ohms setting), the switch functions may be
tested to determine whether continuity exists between
the various terminals for each position. Verify continuity
between switch terminals. Replace switch if testing
identifies a faulty switch.
7. Connect the harness connector to the switch after
testing.
8. If switch tests correctly and circuit problem still ex-
ists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 10 -- Foldout Draw-
ings).
9. Installfrontsteering tower cover (see SteeringTower
Assembly inthe Service and Repairs section of Chapter
7 -- Chassis).
1. Steering tower
2. Increment/decrement switch
Figure 75
1
2
Figure 76
12
4
3
56
BACK OF SWITCH
SWITCH
POSITION
CLOSED
CIRCUITS
OPEN
CIRCUITS
SPEED
INCREASE
2+3
5+6
2+1
5+4
NEUTRAL NONE ALL
SPEED
DECREASE
2+1
5+4
2+3
5+6