Groundsmaster 4100−DPage 5 − 16Electrical System
Hour Meter
The hour meter is located on the control console next to
the operator seat.
1. Disconnect harness connector from hour meter.
2. Connect the positive (+) terminal of a 12 VDC source
to the positive (+) terminal of the hour meter.
3. Connect the negative (−) terminal of the voltage
source to the other terminal of the hour meter.
4. The hour meter should move a 1/10 of an hour in six
minutes.
5. Disconnect voltage source from the hour meter. Re-
connect harness connector to hour meter.
Figure 23
Glow Relay
The glow relay is attached to the the right side of the fuel
tank support under the hood (Fig. 24).
Testing
NOTE: Prior to taking small resistance readings with a
digital multimeter, 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 the measured value for the tested component.
1. Disconnect the harness connector from the glow
relay.
2. Using a multimeter (ohms setting), measure coil re-
sistance between terminals 85 and 86 (Fig. 25). Resist-
ance should be between 70 and 100 ohms.
3. Verify infinite resistance (no continuity) between ter-
minals 30 and 87.
4. 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.
5. Disconnect meter leads and jumper wires from the
relay terminals. Reconnect glow relay to machine wire
harness.
1. Glow relay 2. Fuel tank support
Figure 24
1
2
Figure 25
86 87
85 30
85 86
87
30
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