The coil output is the same either way. It's the spark plug where it
makes a difference. Check out this link for an explanation:
http://www.chicagolandmgclub.com/techtips/general/574.html
Matt
On Thu, 2008-08-28 at 22:29 -0700, Nancy Seabrook wrote:
> On Aug 28, 2008, at 10:10 AM, Lawrie Alexander wrote:
>
> > Thanks to all who ventured opinions on my query about old coils marked
> > CB and SW and their suitability for negative ground cars.
> >
> > The consensus was that switching polarity would affect spark
> > intensity. John Seim suggested looking at a plug and noting whether
> > the spark jumped from the center pole to the side or vice-versa, then
> > wiring the coil so that the former condition existed. Here's the
> > result of my testing ....
> >
> > The car is a TD special wired negative ground, the coil a Lucas Sport
> > Coil dated 1966. With one lead connected to a new plug grounded
> > against the block, wiring the coil either way made no difference; the
> > spark jumped from the center pole to the side (though both sparks
> > looked rather anemic). I then tried holding the coil wire close to the
> > block and saw a nice fat blue spark which could jump 7/8" - once
> > again, with no visible difference whether the CB or the SW was wired
> > from the coil to the distributor.
> >
> > So, whatever the theory, it appears switching polarity on the car and
> > using an old coil doesn't really make much difference, if any!
> >
> > Lawrie
> >
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