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Thread: Ground loops

  1. #1 Ground loops 
    2x4
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    Hello, Im from Brazil, i have read some topics, and i have questions:

    Recently, more attention has been paid to the benefit of providing multiple ground points to an engine. There have been plenty of articles in enthusiasts' magazines that show small but significant increases in horsepower by simply adding additional ground or "earthing" wires. Here in the United States, "grounding" is the term used. Practically every other English speaking country in the world calls it "earthing."

    Conventional thinking used to be that grounding was an "all or nothing" phenomenon. Either your car battery was grounded, or it wasn't. The amount of electrical current running through the negative battery terminal is equal to that running through the positive end. The battery represents part of a giant, complete circuit for everything electrical in the car, no matter how far away that component is from the battery, or more precisely, the battery ground.


    Doesn't grounding to two spots on the body and or motor cause potential ground loops? I thought you were only supposed to ground to one location (one spot on the body and one spot on the motor)... so wouldn't replacing the factory 8 guage ground wires with 4 guage be a better solution?


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  3. #2  
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    If you just want to add another ground strap on your car battery, there is no concern for ground loops. The grounds would be so close together, there is nothing that would create a potential difference between the grounding points to cause a ground loop.

    I suppose if your car battery has two sets of terminals, it wouldn't be a bad idea to connect both negative posts to the car chassis. That way, if the terminals got corroded you would have a better conduction path. But, from what I've seen, its the positive terminal that seems to get the most corrosion on it anyway.

    My advice would be to keep the battery terminals clean and tight. That would be a lot more important that adding another ground strap.

    I'd be a little skeptical about the supposed benefit of some super duper grounding system. The auto magazine writers have to have somthing to write about, and they probably have advertisers who expect the magazines to help them hype their auto grounding system.


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  4. #3  
    2x4
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    ok my friend, thank you for attention
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  5. #4  
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    I agree.. Can't see any point in doing it. There will current loops in the car body anyway. Keep terminals clean and fastened tight.
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  6. #5  
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    Can't see how you will increase horsepower by grounding in more than one place. Most modern systems are electronic (and usually digital) and will be tolerant of supply voltage variations (ie from a cold start battery voltage to full revving alternator output).

    THere is a good reason to have only one solid connection to the battery terminal that runs to ground, and that is to enable you to work safetly on the electrical system by disconnecting just the wire to ground. If you then inadvertantly short the positive terminal or any positive part of the wiring to chassis there will be no spark/short circuit.

    In short if more grounds improve the electrics of your car, there is almost certainly a fundamental design flaw inherent in the system or, due to age connections/wires have become tarnished/corroded.
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