[TR] coil questions

[Geo Hahn]

I would never discard a coil just because of age -- I have had too many new
ones fail quickly and too many old ones that never die.

Not sure why you want to delete the ballast arrangement but if you do and
want to use the coil the same for starting and running then you still need
a resistor or, as you say, a change to a 3Ω coil.

Geo

On Tue, Apr 4, 2017 at 7:12 PM, Sujit Roy <triumphstag at gmail.com> wrote:

> I have a spare coil dated '73.  Has technology changed so much that I
> should discard this and when needed buy a modern one?
>
> There are so many vendors claiming hi tech coils. Is this a load of
> baloney?
>
> My Stag has a ballast resistor so for starting a full 12 v is supplied to
> the coil on general running 6 volts is used. Am I killing my coil by
> spiking it with 12 volts?
>
> The resistance of the coil is specked at 1.5 ohoms.
>
> If I remove the ballast resistor and just supply 12 volts all the time,
> should I now get a 3 Ohm resistance coil?
>
> Based on the current and calculations below, this sort of make sense. Am I
> right?
>
>
> V=I xR
> 12 = I x 3 I = 4A
> 6v = I x 1.5 I =4A
>
> Sujit
>
>
>
> --
> Sujit Roy
> Cupertino, California
>
> https://triumphstagblog.wordpress.com/
>
>
>
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