welding exhaust
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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 ...
  1. #1
    hog1340 is offline Cadillac Owners Member
    Automobile(s): 1995 SLS
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    welding exhaust

    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.

    Thanks Ed

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: welding exhaust

    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.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: welding exhaust

    I recall someone doing that and having some real problems with the PCM. Sub is probably right, but I'd disconnect the negative battery cable anyway just to be safe.

  5. #4
    Ian-STS99 is offline Cadillac Owners Fanatic
    Automobile(s): 2005 Deville
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    Re: welding exhaust

    As Ranger said, I'd rather be safe than sorry.

  6. #5
    johnny kannapo's Avatar
    johnny kannapo is offline Cadillac Owners Connoisseur
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    Re: welding exhaust

    Goodall makes a surge protector model 53-030, it simply clamps to the battery like a jumper cable, Its a must for a automotive welder shop. A big time saver for around $70.

  7. #6
    hog1340 is offline Cadillac Owners Member
    Automobile(s): 1995 SLS
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    Re: welding exhaust

    Thanks for all the replies. Johnny I'm gonna look into the SP.

    Thanks again.

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