Can welding without disconnecting batteries affect computer on commercial vehicles?

Yes, welding without disconnecting the batteries can potentially damage the electronic control units (ECUs) and other sensitive components in commercial vehicles. The electrical surge generated during welding can create voltage spikes, which may lead to malfunction or permanent damage to the vehicle's computer systems. To avoid such risks, it is advisable to disconnect the batteries or use appropriate welding techniques, such as grounding the workpiece properly.