1. Stop the engine. Turn the switched power to the
OFF position.
2. Ensure that the fuel supply to the engine is turned
off.
3. Disconnect the negative battery cable from the
battery. If a battery disconnect switch is provided,
open the switch.
4. Disconnect all electronic components from the
wiring harnesses. Include the following
components:
• Electronic components for the driven
equipment
• ECM
• Sensors
• Electric operated fuel pump
• Electronically controlled valves
• Relays
• Aftertreatment ID module
NOTICE
Do not use electrical components (ECM or ECM sen-
sors) or electronic component grounding points for
grounding the welder.
Illustration 43 g06477753
Use the example above. The current flow from the
welder to the ground clamp of the welder will not
damage any associated components.
(1) Engine
(2) Welding electrode
(3) Keyswitch in the OFF position
(4) Battery disconnect switch in the open position
(5) Disconnected battery cables
(6) Battery
(7) Electrical/Electronic component
(8) The component that is being welded
(9) Current path of the welder
(10) Ground clamp for the welder
5. Connect the welding ground cable directly to the
part that will be welded. Place the ground cable as
close as possible to the weld to reduce the
possibility of welding current damage to the
following components. Bearings, hydraulic
components, electrical components, and ground
straps.
Note: If electrical/electronic components are used as
a ground for the welder, or electrical/electronic
components are located between the welder ground
and the weld, current flow from the welder could
severely damage the component.
6. Protect the wiring harness from welding debris and
spatter.
7. Use standard welding practices to weld the
materials.
M0094137-02
77
Maintenance Section
Welding on Engines with Electronic Controls
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