ELECTRIC SYSTEM CD5515-2/YB5515-2 SERVICE MANUAL
3-2 Published 1-20-2017, Control# 483-02
3. In series circuit arrangements, the voltage is completely
used in the circuit when the current is flowing. In parallel
circuit arrangements, the voltage is constant.
4. When the voltage is constant, resistance controls the
rate of current (amps) in the circuit. Refer to Ohm’s Law.
Comparing Electrical System to a Hydraulic
System
The electrical system is in many ways similar to a hydraulic
system. Both systems need a “pump” to cause the flow
which generates the energy. Each system needs a complete
circuit so the flow can return to storage or supply. Both
systems need “valves” to control the flow through the
system. See Table 3-1.
Table 3-1
Comparing Electrical System and Hydraulic System
Magnetism
When electrical current passes through a conductor it
creates a magnetic field around the conductor. This
magnetic field can be used to induce current into a second
conductor. This is the principle behind generators, coils,
relays and solenoids, which are the working components of
the electrical system. These components will be covered
further in the discussion of the electrical system.
MAIN ELECTRICAL SYSTEM
General
The electrical system used on this machine is a 12 volt,
direct current (DC) system with a (-) negative ground. The
power is supplied by one (two with diesel engine cold start)
12 volt battery.
An alternator supplies the necessary current (amps) for
system operation, and charging of the batteries, when the
engine is running. A voltage regulator on the alternator
controls the voltage in the charging system. A warning light
in the dash indicates when the alternator is not charging the
battery.
Wire Harnesses
Five wire harnesses connect the electrical system
components:
• Dash Wire Harness
• Main Frame Wire Harness
• Engine Wire Harness
• Boom Wire Harness
• Cab Wire Harness
Fuses
The fuses are located for easy access directly below the
instrument panel. See Figure 3-1.
Another fuse box is located in the battery/relay compartment.
Its fuses are identified in Figure 3-4.
Identification of the fuse ratings and the circuits protected is
shown in Table 3-2. Always replace the fuse with one of the
same rating.
ELECTRICAL SYSTEM HYDRAULIC SYSTEM
Alternator Pump
Battery Reservoir
Switches Valves
Wires and Cables Tubes and Hoses
Diodes Check Valves
Volts PSI or bar
Amps gpm or L/min
Ohms Resistance
Reference Only
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