Rev. E
Groundsmaster 4100−D Page 5 − 7 Electrical System
Electrical System Quick Checks
Battery Test (Open Circuit Test)
Use a multimeter to measure the voltage between the
battery terminals.
Set multimeter to the DC volts setting. The battery
should be at a temperature of 60
o
F to 100
o
F (16
o
C to
38
o
C). The ignition key should be off and all accessories
turned off. Connect the positive (+) meter lead to the
positive battery post and the negative (−) meter lead to
the negative battery post.
NOTE: This test provides a relative condition of the bat-
tery. Load testing of the battery will provide additional
and more accurate information.
Voltage Measured
Battery Charge Level
12.68 V (or higher) Fully charged (100%)
12.45 V 75% charged
12.24 V 50% charged
12.06 V 25% charged
11.89 V 0% charged
Check Operation of Interlock Switches
CAUTION
Do not disconnect safety switches. They are for
the operator’s protection. Check the operation of
the interlock switches daily for proper operation.
Replace any malfunctioning switches before op-
erating the machine.
Interlock switch operation is described in the Operator’s
Manual. Testing of interlock switches and relays is in-
cluded in the Component Testing section of this Chap-
ter.
Electrical
System
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