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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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