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8.6 Precautions for electric welding
8 Electrics/electronics
MITSUBISHI FUSO body/equipment mounting directives for FE Issue date: 20. 10. 2020
! Only print out complete sections from the current version
8.6 Precautions for electric welding
When a worker carries out arc welding, the electrical
harness of the vehicle and also the electronic devices
sometimes become damaged. To prevent this,
observe the following precautions.
• Preparations for arc welding
On the vehicle are mounted electronic devices and
an electronic control unit (ECU) which are
connected directly to the battery. If you carry out
arc welding with these devices connected, current
from the welding machine may flow in the reverse
direction through the ground circuit and damage
the devices.
If you do not observe the precautions for welding,
welding current will flow through the following
circuit: É 8.6
Before carrying out welding, carry out the following
work.
(a) Turn OFF the starter switch
(b) Disconnect the battery cables from negative
terminals of the batteries, and cover the ends of
the cables.
Disconnect the harness connectors connected
to the 12 V and 24 V terminals of the battery
equalizer from the positive terminals of the
batteries, and cover the ends of the cables.
(c) Wait for at least one minute. (because SRS
airbags are installed)
(d) Be sure to ground the welding machine at a
point near the welding area.
• When welding to the cabin
Ground the cabin using a nearby plated bolt
or a metallic part of the cabin.
When grounding the cabin itself, remove the
paint from the grounding point.
• When welding to the frame
Ground the frame using a nearby plated bolt
or the frame.
When grounding the frame itself, remove the
paint from the grounding point.
Do not obtain an ground using a chassis
spring because this may result in damage to
the spring.
24 V battery
12 V battery Equalizer
24 V
12 V
N54.10-2340-00
1 Turn OFF the starter switch.
2 Disconnect the cable from the negative terminal of the 12 V battery, and cover the end of the cable.
3 Disconnect this cable from the negative terminal of the 24 V battery, and cover the end of the cable.
4 Disconnect the cable from the positive terminal of the 12 V battery, and cover the end of the cable.
5 Disconnect the cable from the positive terminal of the 24 V battery, and cover the end of the cable.
6Frame
7 Gound the welding machine at a point near the wel-ding area.
8ECU
9Welding machine
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