Bob, I think thats a little high and Ive read (cant recall where) numbers more in the 3 ohm range.
Heres my reasoning FWIW why 3 is about right.
Typical field currents (for some Delcos Im aware of) are like 2 amps which means in a 6 volt genny the total resistance of the two field windings is about 3 ohms sooooooooo if you add another 3 ohms that reduces the gennys output significantly but I think 4 to 5 ohms would reduce it wayyyyy toooooooo much.....
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