Sounds just like an external ballast reisistor. Check the resistance
between the coil terminals. If its very low, then that doohicky is just
what you think. As for question 2, no idea at all.
> So, while plowing out of the most recent Michigan snow with my '53 Ford
> NAA "red belly," the thing conks out (very unusual). While trying to
> track down the problem (turned out to be a bad condenser), I noticed the
> coil + terminal was wired to a ceramic doo-hickey behind the dash. The
> doohickey was getting battery voltage in, and it was showing the
> expected 12.6 volts at its other terminal. BUT as soon as I
> re-connected the wire to the coil, that terminal read just over 6 volts.
> Ahhh, says I with a smug smile. Not to worry. This must be an external
> ballast for the coil.
>
> Question #1: Is it?
>
> Question #2: How come I only saw voltage drop when I connected the coil?
>
> Teach me.
>
> -JohnD
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