I got the information from an old Autolite manual, likely the same one you saw.
It is hard or impossible to get the original resistance from a broken carbon resistor. Measuring with a thin probe tip at one small point will give a higher resistance than the real resistance which is over a much larger, broken, area. That method will work with a wire wound resistor but not a carbon resistor.
I have used the ceramic sand covered wire wound resistors for this type of application. At least 30 watt in size.
The resistance is not critical, a 3 ohm should work.
The Autolite two charge regulators, like what you have, work differently than the standard vibrating regulators. The resistors are a good bit lower in resistance than what you may be used to seeing with the standard regulators.
Since it is used with a 3 brush generator, protecting the output from overload is not needed since they are self limiting. The field current is not self limiting which is the reason for the 5 amp fuse in the field circuit.
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