GROVE Published 1-20-2017, Control# 483-02 3-1
CD5515-2/YB5515-2 SERVICE MANUAL ELECTRIC SYSTEM
SECTION 3
ELECTRIC SYSTEM
SECTION CONTENTS
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Comparing Electrical System to a Hydraulic
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Magnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Main Electrical System. . . . . . . . . . . . . . . . . . . . . . 3-2
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Wire Harnesses . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Charging System . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Alternator and Voltage Regulator . . . . . . . . . . . . . 3-5
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Battery Disconnect Switch . . . . . . . . . . . . . . . . . . 3-5
Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . 3-5
Battery Maintenance and Charging . . . . . . . . . . . 3-5
Starting Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
General Inspections . . . . . . . . . . . . . . . . . . . . . . . 3-6
Starting Circuit Check . . . . . . . . . . . . . . . . . . . . . . 3-6
Instrument and Light Circuits . . . . . . . . . . . . . . . . 3-7
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Light Bulbs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Gauges and Indicators. . . . . . . . . . . . . . . . . . . . . . 3-7
ECM Display Toggle Switch . . . . . . . . . . . . . . . . . 3-7
Wire Harnesses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Engine Wire Harness. . . . . . . . . . . . . . . . . . . . . . . 3-8
Main Frame Wire Harness. . . . . . . . . . . . . . . . . . . 3-8
Dash Wire Harness . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Cab Wire Harness . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Boom Wire Harness. . . . . . . . . . . . . . . . . . . . . . . . 3-8
Accessory Circuits . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Anti-Double Blocking System . . . . . . . . . . . . . . . 3-17
Rated Capacity Limiter (RCL) System. . . . . . . . . 3-17
Optional Engine Shutdown . . . . . . . . . . . . . . . . . 3-17
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
GENERAL
To aid in the understanding and troubleshooting of an
electrical system, review the terms and information that
follows.
Electrical Energy - power which comes from the movement
of electrons. Electrons are particles with a negative charge.
Electrons will collect around particles with a positive charge,
called protons, until an electrical imbalance occurs.
Amperage - rate of flow of electrons (CURRENT), measured
in amperes.
Voltage - the electromotive force (EMF) which causes
electrons to move through an electrical circuit, measured in
volts.
Resistance - any resistance to flow of electrons in an
electrical circuit, measured in Ohms.
Ohm’s Law - “Electric current increases in direct relation to
the voltage and decreases in relation to the amount of
resistance in any circuit.”
To Find:
• EMF (Voltage) - Multiply CURRENT (amps) by
RESISTANCE (Ohms).
• RESISTANCE (Ohms) - Divide EMF (voltage) by
CURRENT (amps).
• CURRENT (Amps) - Divide EMF (voltage) by
RESISTANCE (Ohms).
Consider the following when trying to find trouble in an
electrical system:
1. Current always flows from (+) positive to (-) negative, or
from the point of highest voltage.
2. Because the system used on this machine is a negative
ground system, current that leaves the supply (battery)
returns to the supply (battery).
CAUTION
Know the electrical circuit before connecting or
disconnecting an electrical component. A wrong
connection can cause personal injury or damage to the
component and/or system.
Reference Only
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