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Groundsmaster 4000--D/4010--DPage 5 -- 42Electrical System
Air Conditioning Switch (Groundsmaster 4010--D)
The air conditioning switch is used to control operation
of the air conditioning system on the Groundsmaster
4010--D. The switch is located in the cab headliner (Fig.
48).
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
49. The circuit logic of the air conditioning switch is
shown in the chart below. With the use o f a multimeter
(ohmssetting), theswitch functions maybe testedto 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 48
1
2
Figure 49
BACK OF SWITCH