Quote:
Originally Posted by Aarongriffey
Some new round coils need external resisters and some have a resister buil in.
I have see thirties and forties cars running without a resister or bypassed.
It shortens the life of the points though.
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Sorry, this is not correct information. The resistance of a coil is determined by the number of windings and the material it is constructed from. I'm sure you can find a coil built for some application that has the wrong resistance for a 6v system. But 6v volt coil (~1.5 ohms) do not use a ballast resistor and the ignition system is designed to work with this combination (we are talking "can" coils here, not the original OEM style of coils). In a 12v volt system, you can use the same coil coupled with a ballast resistor (~1.5 ohm coil + ~1.5 ohm resistor = ~3.0 ohms) OR a coil with a ~3.0 ohm coil without a ballast resistor. But on the 6v system use a 1.5 ohm coil no ballast resistor is use and putting with in the circuit can interduce problems.