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  1. #1
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    How to resolve open ground

    I have a Grand design M I am connected to a 120 with converters and the surge protector is showing a message of open ground. How can I fix it

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    What is the source of your power? A household outlet?

    Do you have a way to measure voltage?

    The most common issue is a bad extension cord, so if you can’t measure, try a different one.
    John & Kathy
    2014 F250 Lariat FX4 6.2L SBCC
    2014 Reflection 303RLS
    SW Indiana

  3. #3
    Big Traveler dryfly's Avatar
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    Quote Originally Posted by jkwilson View Post
    What is the source of your power? A household outlet?

    Do you have a way to measure voltage?

    The most common issue is a bad extension cord, so if you canít measure, try a different one.
    I'm thinking the OP is still going to get 120vac between hot and neutral even with an open ground. Seems like measuring between hot and ground, starting with the power source and working towards the trailer would be a solution.

    Also, I don't know how sensitive these surge protectors are. Will they show an open ground it the wire is loose, presenting a high resistance but still allowing current to flow, or does the ground have to be completely open.

    If "converters" means adapters it's highly possible the trouble lies there.
    Last edited by dryfly; 06-21-2024 at 07:51 AM.
    2020 Reflection 273MK

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    Quote Originally Posted by dryfly View Post
    I'm thinking the OP is still going to get 120vac between hot and neutral even with an open ground. Seems like measuring between hot and ground, starting with the power source and working towards the trailer would be a solution.

    Also, I don't know how sensitive these surge protectors are. Will they show an open ground it the wire is loose, presenting a high resistance but still allowing current to flow, or does the ground have to be completely open.

    If "converters" means adapters it's highly possible the trouble lies there.
    Yes, but they won’t get 120V between hot and ground with an open ground.

    Resistance doesn’t much matter as far as detecting an open ground. No significant current flow in the ECG, so resistance won’t change the voltage enough to notice.
    John & Kathy
    2014 F250 Lariat FX4 6.2L SBCC
    2014 Reflection 303RLS
    SW Indiana

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    Big Traveler dryfly's Avatar
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    Quote Originally Posted by jkwilson View Post
    Yes, but they won’t get 120V between hot and ground with an open ground.
    Right. That's why I'm saying start measuring at the known good power source between hot and ground, and work downstream to the trailer. As long as the OP is getting a good voltage measurement he will know he still has a good ground. Once there is zero voltage measurement he has found the open ground issue.

    I know there are other ways like testing continuity, but testing voltage might be the easiest.
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    Quote Originally Posted by dryfly View Post
    Right. That's why I'm saying start measuring at the known good power source between hot and ground, and work downstream to the trailer. As long as the OP is getting a good voltage measurement he will know he still has a good ground. Once there is zero voltage measurement he has found the open ground issue.

    I know there are other ways like testing continuity, but testing voltage might be the easiest.
    Nothing wrong with your logic, but I’d want to verify there is even a problem outside the EMS before hunting.
    John & Kathy
    2014 F250 Lariat FX4 6.2L SBCC
    2014 Reflection 303RLS
    SW Indiana

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