Before Carrying Out Troubleshooting Of Electrical System - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02632-02

Before carrying out troubleshooting of electrical system

Connection table of fuse box
a This connection table shows the devices to which each power supply of the fuse box supplies power (A
switch power supply is a device which supplies power while the starting switch is in the ON position and
a constant power supply is a device which supplies power while the starting switch is in the OFF and ON
positions).
a When carrying out troubleshooting related to the electrical system, you should check the fuses and fus-
ible links to see if the power is supplied normally.
Type of power supply
Switch power supply
Switch power supply
Switch power supply
Constant power sup-
ply
Starting switch
Switch power supply
4
Fusible link Fuse No.
1
2
F04
3
(65A)
4
5
6
7
8
F04
(65A)
9
10
11
12
13
F04
14
(65A)
15
16
F05
17
(30A)
18
19
20
ACC
Fuse
capacity
Emergency switch, pump resistor, lamp switch, swing
10A
holding release switch
Pump controller (Solenoid power supply)
30A
Machine push-up switch
PPC oil pressure lock solenoid valve
10A
Starting motor cut-off relay
Cigarette lighter
10A
Windshield washer motor, electrical intake air heator
relay
10A Horn relay, horn
10A Auto preheater
10A Rotary lamp (if equipped)
20A Working lamp (boom), working lamp (rear)
Radio, speaker
10A
Left knob switch (pump controller input)
20A (Spare)
20A Air conditioner unit
10A (Spare)
10A Headlamp
10A Optional power supply (1)
Travel alarm, 12 V power supply, heated seat
(if equipped)
20A
Optional power supply (2), heated seat, air suspension
seat
Radio (backup power supply)
10A
Room lamp
Pump controller, starting switch
20A
Machine monitor
10A (Spare)
30A Engine controller
5A Engine controller (ACC signal)
40 Troubleshooting
Destination of power
PC300, 350-8
1