Hitachi ZW180, Technical Manual

Page: 162 / 374

SYSTEM / Electrical System
T2-4-12
CHARGING CIRCUIT (KEY SWITCH: ON)
•
When the engine starts and the key switch is
released, the key switch returns to the ON
position.
•
Terminal B is connected inside the key switch to
terminals ACC and M with the key switch ON.
•
Current from terminal M of the key switch excites
the battery relay through fuse #8 of fuse box A.
•
When the engine rotates, the alternator begins
generating electricity. Current from terminal B of
the alternator flows to the battery through the
battery relay and charges the battery.
•
Current from terminal L of the alternator flows to
terminal 2-2 of the monitor unit as a signal that the
alternator begins generating and the monitor unit
turns off the alternator indicator, and also flows to
terminal C-8 of ICF and terminal A-3 of GPS in
order to record history data of the engine
operation time.