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Groundsmaster 4000−DPage 5 − 14Electrical System
Hour Meter
The hour meter is located on the control console next to
the operator seat.
1. Connect the positive (+) terminal of a 12 VDC source
to the positive (+) terminal of the hour meter.
2. Connect the negative (−) terminal of the voltage
source to the other terminal of the hour meter.
3. The hour meter should move a 1/10 of an hour in six
minutes.
4. Disconnect voltage source from the hour meter.
Figure 18
Audio Alarm
The audio alarm for low engine oil pressure or high en-
gine coolant temperature is attached to the control con-
sole next to the operator seat.
IMPORTANT: Make sure to observe polarity on the
alarm terminals when testing. Damage to the alarm
may result from an improper connection.
1. Isolate alarm from the circuit. Correctly connect
12VDC source to the terminals (Fig. 19).
2. Alarm should sound. Remove voltage source from
the alarm. Reconnect alarm to the circuit.
1. Top view
2. Bottom view
3. Positive (+) terminal
4. Negative (−) terminal
Figure 19
1
2
3
4
Glow Relay
The glow relay is attached to the the right side of the fuel
tank support under the hood.
NOTE: Prior to taking small resistance readings with a
digital multi meter, short the meter test leads together.
The meter will display a small resistance value (usually
0.5 ohms or less). This resistance is due to the internal
resistance of the meter and test leads. Subtract this val-
ue from from the measured value of the component you
are testing.
1. Verify coil resistance between terminals 86 and 85
with a multimeter (ohms setting). Resistance should be
from 41 to 51 ohms.
2. Connect multimeter (ohms setting) leads to relay ter-
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.
3. Disconnect voltage and leads from the terminals.
Figure 20
86 87
85 30
30
87
85 86