Groundsmaster 4100−D Page 5 − 17 Electrical System
Start, Engine Shutdown, Seat, PTO, Alarm, Down Latching, and
Over Temperature Relays
These seven relays are located under the console hous-
ing cover. The wiring harness is tagged to identify each
relay.
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 from the measured value of the component you
are testing.
1. Disconnect the harness connector from the relay
that is to be tested.
2. Using a multimeter (ohms setting), measure coil re-
sistance between terminals 85 and 86 (Fig. 26). Resist-
ance should be between 70 and 90 ohms.
3. 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.
4. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
5. Connect multimeter (ohms setting) leads to relay ter-
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.
6. Disconnect voltage and multimeter leads from the
relay terminals. Reconnect relay to machine wire har-
ness.
Figure 26
86
85
87A 87
30
Electrical
System
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