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Groundsmaster 5900/5910 Page 5 -- 47 Electrical System
Air Conditioning Switch (Groundsmaster 5910)
The air conditioning switch is used to control operation
of the air conditioning system. The switch is located in
the cab headliner (Fig. 85).
Testing
1. Make sure ignition switch is OFF. Remove key from
ignition switch.
2. Remove switch plate from cab headliner.
3. Locate air conditioning switch and unplug wire har-
ness connector from switch.
4. The switch terminals are marked as shown in Figure
86. The circuit logic of the air conditioning switch is
shown in the charttothe right. With theuse of a multime-
ter (ohms setting), the switch functions may be tested to
determine whether continuity exists between the vari-
ous terminals for each position. Verify continuity be-
tween switch terminals. Replace switch if testing
identifies a faulty switch.
5. Connect the harness connector to the switch after
testing.
6. 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).
7. Install switch plate to cab headliner.
1. Cab headliner 2. Air conditioning switch
Figure 85
1
2
Figure 86
12
4
3
56
BACK OF SWITCH
SWITCH
POSITION
CLOSED
CIRCUITS
OPEN
CIRCUITS
AC OFF 2+3
5+6
2+1
5+4
AC ON 2+1
5+4
2+3
5+6
Electrical
System