Here's a backside view of a switch as on your B. The field resistor is the wirewound unit at the bottom. Seems to me the correct resistance is 3 or 4 ohms - however I'm only going from memory here...
However if it were mine I'd replace the cutout relay with a voltage regulator. The V/R will do a much better job of maintaining the battery, and it will eliminate the need for the field resistor.
I believe the fuse is an SFE 10 (glass tube type, 10 amp). However later letter series and Supers used an SFE 20 (20 amp) fuse - that's what I recommend.
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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