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  1. #1
    Join Date
    Mar 2007

    Default Positive ground generator/welder

    I just bought an old "AIRCO" engine driven welder generator. It is old enough that it has a "positive ground" battery starter/ignition. Two cylinder ONAN gas engine. 350 amps DC welder, 110 volt - 220 volt AC generator, 110 volt DC generator (45.5 AMPs at 110 volts, 10 KW nameplate rating).

    I bought it primarly to run my well during power outages.

    I did not realize that the ignition/starter circuit was positive ground and of course, it may make no difference at all.

    I do realize the the 220 (240) volt circuit does not use "ground" as part of the circuit

    My concern is - if I ground the generator frame to earth (mechanical ground) as my neighbor has with his generator, will there be any adverse results?


    Rose is Rose

  2. #2
    Veteran Member
    Join Date
    Sep 2001
    Kubota L3000DT

    Default Re: Positive ground generator/welder

    I think you will be all right grounding the chassis. After all, what you are protecting against is case where the generator voltage (which is a/c) gets on the chassis, which would create a voltage potential to earth ground. The positive ground of the starting circuit is not factor at that point.
    Meetings: If more than two people are there, at least one's time is being wasted.

  3. #3
    Elite Member DieselPower's Avatar
    Join Date
    Sep 2006
    Fairfield, PA
    JD 3020, JD 4230, JD 7410, JD 2440, MF 750, NH LS170

    Default Re: Positive ground generator/welder

    No problem grounding the chassis. These are two different circuits, the DC engine system and the AC generator/welder circuit. A/C (alternating current) does not have a - or +, only hots and neutral/ground.

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