Andy,
The voltage needed (desired) is dependent upon the coil used. So, if your
using a stock coil it should be what the factory dictated (sorry, I don't
know that voltage). If your using an aftermarket coil the resistance should
be that spec-ed by the coil manufacturer. If one is running a Pertronix
module (many do) you need to be careful to wire that to switched 12 volts -
and then have the output go through the resistor to the coil. A common error
is to wire the Pertronix after the resistor and the voltage can be too low
for it to operate properly.
Lastly, I recall the wire wound resistors actually having the voltage change
as temperatures rise and fall (anyone confirm???). Sorry I can't directly
answer your 12V vs 10V question. On the other hand I have dealt with a
similar situation and found myself being "the dog chasing his tail" because
there were many things to factor beyond that which seemed obvious. So, with
that in mind I thought I would throw this out there.
Tom Witt
Hey, guys:
>
> How much voltage should get through the ballast resistor going to the
> points? My multi-meter shows a full 12 volts going in and 10 volts coming
> out. I was always under the impression that the resistor was supposed to
> cut the voltage to the points almost in half. Which is correct?
>
> Thanks,
> Andy Walker
> Edmond, OK
> B382001600LRXFE
> TAC #740
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