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Groundsmaster 4100--D/4110--D Page 5 -- 43 Electrical System
Air Conditioning Switch (Groundsmaster 4110--D)
The air conditioning switch is used to control operation
of the air conditioning system on the Groundsmaster
4110--D. The switch is located in the cab headliner (Fig.
50).
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
51. The circuit logic of the air conditioning switch is
shown in the chart below. With the use of a multimeter
(ohms setting), the switch functions may be tested to de-
termine whether continuity exists between the various
terminals for each position. Verify continuity between
switch terminals. Replace switch if testing identifies a
faulty switch.
SWITCH
POSITION
CLOSED
CIRCUITS
OPEN
CIRCUITS
AC OFF 2+1
5+4
2+3
5+6
AC ON 2+3
5+6
2+1
5+4
5. 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).
6. Connect the wire harness connector to the air condi-
tioningswitchaftertesting.
7. Install switch plate to cab headliner after switch test-
ing is complete.
1. Cab headliner 2. Air conditioning switch
Figure 50
1
2
Figure 51
BACK OF SWITCH
Electrical
System