You're all missing one question I think, is the additional earth the same cross sectional area as the installed one, or is it bigger/smaller?
This will affect the results as in this case, size does matter
Perhaps oldgeezer can answer this fundamental question?
Don't just presume the current will be equally split.

It depends what type of earth cable you have ,and if it was one of those manufactured a few years ago
(with little arrows on the insulation to show which direction the "current has to flow "... )


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Surely the volts remain the same across several earths but the amps are divided across the number of leads? They cant all carry max amps each At work
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bish789 wrote:

... is the additional earth the same cross sectional area as the installed one

Quote:

Surely the volts remain the same across several earths but the amps are divided across the number of leads? They cant all carry max amps each

Quote:

arrows on the insulation to show which direction the "current has to flow "

Yes, if it is I hope he's got it the right way round

Erm, but what *is* the right way round given that batteries both charge and discharge...!

The suspense waiting for the answer is killing me.

So if og, s new lead is showing high amps it shows the origonal was weak At work
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"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

We know his original cable was weak, it had corroded and his "miracle" cure of a new cable seems to have cured his ills, this is fact but why we need to guess how many amps flow through it is beyond me.
You can fit a second earth strap to a perfectly good car and you will get a reading of current flow, so what it proves is negligable really, if you could measure the impedance of the circuit and determine where any resistive areas where located that may be useful, in this case its nonsense that provides very little in the way of a solution to remedy the cause rather than just treating the symptoms, which largely dont seem to be occuring in hundreds of thousands of cars.

Agreed, Taz. OG does say, though, that the original cable has now been replaced by LR, so what would be interesting would the the comparison of current in the original and supplementary cables. If the latter is similar or less it tells us nothing (except that things are as we'd expect). But if the current in the supplementary is higher it would tend to support OG's contention that the original earthing is inadequate. Just the current in the second cable alone tells us nothing useful.

we had a tractor with a bad earth connection, countless warning lights for various functions popped up on the display screens, quickly fixed once we stopped panicing and no damage done. so always a good idea to regularly clean your earths.

defenders we had had a similar problem the earth bond, body to chassis used to fail At work
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"I can't always believe facts I read on the web" - Charles Dickens

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is anyone else getting a little bored waiting  Former Mod/Member, with the most post & Chicken George Arch nemesis

Didn't sleep last night cus of it

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Let's throw another one into the equation while we're waiting.
Conventional v true current flow

He does say "up" and " down" so may have that covered, although will more flow down due to gravity