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4. Precautions for Arc Welding
• When arc welding is performed, current from the welder flows to ground via the vehicle’s metal parts. Unless ap-
propriate steps are taken, this current can damage control units, other electrical devices and wiring harnesses.
And any electrical device near the point on the vehicle to which the (–) cable of the welder is connected, might be
largely damaged.
• Current flows backward as shown below.
4.1 From battery (–) cable
To prevent damage to the battery and to electrical devices that are
connected directly to the battery, it is essential to disconnect the
battery’s (–) cable.
4.2 Procedure
• Turn the starter switch to the LOCK position.
• Disconnect the battery’s (–) cable.
• Cover all parts of the vehicle that may be damaged by welding
sparks.
• Connect the welder’s (–) cable to the vehicle as close as possi-
ble to the area being welded. Do not connect the welder’s (–) ca-
ble to the cab if the frame is being welded, and vice versa.
• Set the welding current in accordance with the part being weld-
ed.
PRECAUTIONS FOR MAINTENANCE OPERATION
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