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Groundsmaster 4000--D/4010--DPage 5 -- 34Electrical System
Start and Air Conditioning (Groundsmaster 4010--D) Relays
When energized by the TEC--5002 controller, the start
relay is used to provide current to the engine starter mo-
tor solenoid. The start relay is located at the power cen-
ter behind the operator seat (Fig. 41).
An identical relay is used to control the air conditioning
electrical power circuit on the Groundsmaster 4010--D.
When energizedby the air conditioning switch, the relay
provides current for the air conditioning components.
The relay is attached to the cab headliner above the
switch panel.
The start and air conditioning relays are attached to the
wire harness with a five (5) wire connector (Fig. 42).
Testing
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.
2. To access start relay:
A. Raise and support hood.
B. To make sure that machine operation does not
occur unexpectedly, disconnect negative (--) cable
from battery and then disconnect positive (+) cable
from battery (see Battery Service in the Service and
Repairs section of this chapter).
C. Remove cover (item 1) and heat shield (item 9)
from power center and locate relay to be tested. If
necessary, remove two (2) flange nuts and carriage
screws that secure power center to tank support.
3. To access air conditioning relay, remove screws that
secure switch panel to headliner in cab.
4. Disconnect wire harness connector from relay. Re-
move relay from mounting bracket for testing.
5. Using a multimeter, verify that coil resistance be-
tween terminals 85 and 86 is from 71 to 88 ohms.
6. Connect multimeter (ohmssetting) leads to relayter-
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should make and break
continuity between terminals 30 and 87 as +12 VDC is
applied and removed from terminal 85.
7. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
8. Connect multimeter (ohmssetting) leads to relayter-
minals 30 and 87A. Apply +12 VDC to terminal 85. The
relay should make and break continuity between termi-
nals 30 and 87A as +12 VDC is applied and removed
from terminal 85.
9. After testing, disconnect voltage and multimeter test
leads from the relay terminals.Secure relay tomounting
bracket and connect wire harness connector to relay.
10.Secure all removed components. If battery cables
were disconnected, connect positive (+) cable first to
battery and then connect negative (--) cable to battery
(see Battery Service in the Service and Repairs section
of this chapter).
11.Make sure that hood is secured.
Figure 41
2
3
4
5
1
8
7
6
9
10
1. Cover
2. Screw
3. Flange nut (2 used)
4. Carriage screw (2 used)
5. Screw
6. Mount
7. Lock nut
8. Start relay
9. Heat shield
10. Screw (2 used)
FRONT
RIGHT
Figure 42
86
85
87A 87
30
2
1
3
4
1. Coil terminal
2. Common terminal
3. Normally closed term.
4. Normally open term.
1