Posted by Bob on February 14, 2018 at 08:00:23 from (64.255.159.199):
In Reply to: 6V to 12V.... posted by banjoman09 on February 13, 2018 at 15:57:17:
Quoting Removed, click Modern View to see
"Ford used a resistor to cut the 6 volt down to 4.8 volt thinking points would burn with higher voltage. "
Leroy, "VOLTS" typically don't "burn" ignition points, it's the increased CURRENT that is caused by increasing the supply voltage.
Coils are not created equal, and an OEM 2N coil has a very low primary resistance vs. many other 6 Volt coils as used in other manufacturer's products.
As to modern replacement coils for the "front-mount distributors, apparently their resistance can vary widely from one to another or to the original OEM coil.
The purpose of the ballast resistor is to add resistance to the primary circuit, limiting current through the points.
A commonly accepted primary current upper limit for long point life is about 4 Amps.
Accurately measuring the primary CURRENT is a far more accurate way of determining if more or less primary resistance is needed that an Voltage check.
Lots of anecdotal evidence about all this, such as yours, but a simple Amperage test will "tell the tale".
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