Based on a few old ones I observed over the years (but memory is rusty grrrrr) and a very rough approximation of genny field current and to reduce it to maybe 1/2 or more of what full field current might be,
I guess 2.5 TO 4 OHMS is closer then 10 ohms, I'm afraid a 10 ohm resistor would lower the field current and charge rate wayyyyy too much.
Buy hey, no harm in trying 10 as you can always decrease the resistance as needed, but I think you will end up quite a bit less ohms to reduce the charge rate to maybe 1/2 to 3/4 as much as if on high charge i.e. no added field resistance.....
Dont forget that needs to be a power rated resistor P=ExI remember
Give 10 ohms a try, no harm no foul other then the output will be way too low......
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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