Page Issue 01
Chapter - Electrical System
9:2
VT551 - Maintenance
GENERAL DESCRIPTION
The system is integrated with that of the chassis in that it shares its battery and power source. The
auxiliary engine is equipped with a second alternator to supplement power generation. The system
activates all operational functions of the machine.
SYSTEM DESCRIPTION
The electrical system circuit diagrams are sub divided into modularised sub circuits and are identified
by an eight digit code, i.e. SE511Z01. The first five digits identify the machine and a particular control
feature, the last three digits identify variation and design status of the particular control feature. When the
sixth digit is a ‘Z’, then there is only one design variation, thought there could be other variations identified
by the seventh and eighth digits.
To assist fault finding and troubleshooting, the solenoids have an LED in the electrical connection plug
which illuminate when power is achieved.
RELAY/FUSE BOX
EP
FUSE RATINGS
F11
F12
F13
F14
F15
F1
F2
F6
F8
F10
10A RED
15A BLUE
15A RED
20A YELLOW
5A ORANGE
-
-
-
-
-
-
-
-
-
-
10A RED
20A YELLOW
15A BLUE
15A RED
15A BLUE
93MA. 012-3
MCB
MCB
30A
F1 F2
F13
F14
F15
F6
F8
(A)
F11 F12
F10
10A RED
15A BLUE
10A RED
20A YELLOW
5A ORANGE
10A RED
20A YELLOW
15A BLUE
10A RED
15A BLUE
12V
24V
ALWAYS turn OFF the truck ignition before changing / replacing fuses on the machine.
NEVER carry out welding on the machine without first disconnecting the two plugs on
Node 1 and Node 2 - failure to observe these procedures could damage the nodes.
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and rights are the property of Johnston Sweepers
Ltd
