Volvo VNL 780 Operator's Manual page 457

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MAINTENANCE AND LUBRICATION
CAUTION
If there are other ground cables connected
to the battery (such as engine ECU,
transmission ECU, etc.), disconnect
those wires in the sequence shown,
then remove the main battery ground
cable. Electronic modules may be
damaged when their ground(s) are
connected/disconnected with the main
battery ground disconnected. Therefore,
disconnect the main battery ground last or
when installing, connect the main ground
first.
CAUTION
DO NOT weld on the engine or engine
components. Welding on the engine or
components mounted on the engine can
cause serious damage to the engine ECU.
Before welding on the vehicle, electrical power needs to be disconnected and some
components must also be disconnected:
Ignition OFF position.
W8003619
447

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