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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