Welding Car Without Disconnecting Battery. Make sure the battery negative terminal is disconnected. First make sure that your negative battery terminal is disconnected from the vehicle before you open the electrical circuits to your car battery.
Ive got a brand new MSD box that doesnt work and Im pretty sure its because I did some welding on the chassis without disconnecting it. There are a few vehicles now where the manufacturers DO require disconnecting the battery on newer vehicles last two to three model years but along with that they also require disconnecting several harnesses as well. I just mig welded two rear quarter fix-it panels on my Ford F250.
Is it safe to weld on a vehicle when the battery is connected.
Familiarizing yourself with the settings is a good idea before disconnecting the battery. Many people believe the negative terminal should be disconnected but cannot explain why it should be done. I just mig welded two rear quarter fix-it panels on my Ford F250. Speculation runs rife regarding whether the negative terminal of a vehicles battery should be disconnected before welding on that vehicle.