Mig welding on efi vehicle

[wildstang]

I have to do some mig welding on my 92 ranger and was wondering if most people disconnect the battery or just leave it and weld. My concern is I don't want to potentially fry the computer. Would running a chain or wire and grounding from the frame to the ground be sufficient?

Thanks for any suggestions.

 

[1320stang]

Just disconnect the positive on the battery. What your worried about is backfeeding the ground side of the system. Using a set of jumper cables to ground the body to a metal fence post or if your in a metal shop building, to structure, sure wouldn't hurt.

 

[Ronstang]

You really should disconnect the computer and it's ground also. I always take the computer all the way out just to be safe.

 

[Glen's 1965 5.0]

I disconnect mine also.