I wanted to know if you weld on your car should you unhook the battery so you don't fry anything? I want to make sure before I start welding. Thanks Rob
This. Most everything is grounded to the frame so disconnecting the battery wont really protect any of your electronics. Just keep your welder ground as close to the weld as possible.I never disconnect the battery on anything in the past 25 years I have been welding on vehicles. What is it you think you are protecting by disconnecting the battery ground? The battery..... Everything else is still grounded to the chassis and cable.
If you are really worried about the computer, you should at least unplug it and maybe remove it from the vehicle.
I think it is most important to make sure you have a good ground from your welder and the piece you are welding to. I have seen someone ground the pinion yoke on a rear end to weld the spring perches.....putting all that current through oily pinion bearings! As a joke, I tell by buddies to ground it to the crank snout on the engine so the main bearings get welded.