italie |
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MAME owes italie many thank yous, hah
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Reged: 09/20/03
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Posts: 15246
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Loc: BoomTown
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Re: Part II
12/13/13 03:53 PM
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> Some instructions on how to use jumper cables are wrong if you drive an older
> (stupid) car. My mom had an old Ford before and lost polarity on the alternator
> (basically frying it... wouldn't harge the battery after that) simply because she
> connected the black cable to the negative terminal. The tech said to never do that
> and always just connect the black cable to the frame or whatever.
>
> I never use the negative terminal when using jumper cables because of this and I've
> never had an alternator problem myself.
The reasoning for this one is to avoid a bad ground connection at the terminal, whether from a bad battery cable, or corrosion. If the battery isn't grounded properly, and you connect the positive, you run the chance of throwing enough juice at your alternator circuit to fry the diode. Battery and alternator share a common ground of the frame. Since the battery is cable-grounded to the frame, and the alternator bolts directly to it, it makes more sense to ground there.
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