Fellow listers - especially those of you who understand the ebb and flow of
electrons....
I've always been led to believe that coil polarity is important.If the car
is wired negative ground, the "minus" terminal on the coil should go to the
distributor for maximum spark voltage to be generated. However, today I
presented myself with a puzzle which may be totally erroneous or may, in
fact, need some explanation:
If a coil was manufactured during the days when its intended cars were
predominantly positive ground (example - a Lucas Sports Coil dated 1958),
and has terminals marked "SW" and "CB" rather than "+" or "-", logically the
"CB" terminal would be the "plus" terminal since the points take the current
to a positive ground. Am I right so far? Or did Lucas make its Sports Coils
to fit cars with either positive or negative ground?
Now, if one wanted to put this coil into a car wired negative ground, would
the "CB" terminal still go to the distributor? If reversing the polarity of
the car also requires reversing the terminals on the coil (something I was
told a long time ago), have we in fact now wired the primary voltage to the
secondary circuit in the coil when we connect the coil the other way around?
In short, are coils manufactured for particular polarity in a car and will
their output voltage be reduced if they are wired backwards because the
car's polarity has been reversed?
Any and all insights will be appreciated!
TIA,
Lawrie Alexander
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