Cadillac Seville / Cadillac Eldorado Forum Discussion, welding exhaust in Past Cadillac Vehicle Discussion; I have a small hole in the "y" that splits the two mufflers, and want to weld it closed. My ...
I have a small hole in the "y" that splits the two mufflers, and want to weld it closed. My question is do I have to disconnect the battery and the computer before I weld this hole up? I would rather be safe, but if it isn't necessary I won't do it.
Clamp the welder ground lead to the exhaust pipe or a hanger rod as close to the work as possible. The exhaust is grounded to the engine only, so if you ground to the body there's the possibility of a ground loop in the electrical system grounds. Better to keep the current in the pipe only.
If you can do that ground hookup, you should have no problems with the car's electronics.