Posted by John G. Hasler on December 26, 2008 at 20:12:08 from (72.160.253.193):
In Reply to: Re: jump starter posted by old on December 26, 2008 at 19:46:03:
> Reason they say hook to a metal surface instead > of right to the battery is to keep from having a > spark at the battery.
No. You could get a spark at the positive terminal just as easily as at the negative, but the risk is negligible as there is only hydrogen present when charging and then not much. The reason for instructing you to connect the negative cable to "a metal surface" is to make reverse connection impossible (assuming negative ground). If you connect the black (negative) cable to the frame then the worst you can do with the positive is connect it to the negative battery terminal, shorting the jump charger. If you connect the black cable to what you think is the negative battery terminal and get it wrong when you hook up the positive you will have the two batteries connected in series and shorted. Messy.
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