The question has been answered but perhaps this will help to understand the confusion
The problem with understanding charger connections to a positive ground tractor is that we are so used to jumping modern negative ground vehicles where the black negative cable of the charger is often connected to vehicle frame that we assume the black cable is a ground cable.
Understanding battery chargers (and jumper cables) became easy for me to understand when I realized that the output of a battery charger has a NEGATIVE cable (black clamp) and a POSITIVE cable (red clamp), but that the charger DOES NOT have a designated ground cable. The BLACK cable is a NEGATIVE cable, NOT a GROUND cable.
So always connect Positive to Positive, and Negative to Negative, FORGET ABOUT GROUND. When connecting a charger cable to the frame, do not think of the frame as “ground” but rather think of the frame as an “extension cord” for the associated positive or negative post of the battery.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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