Why do old ford tractors have positive ground?

Why do old ford tractors have positive ground?

That's the British way of doing it. In DC electric circuits it doesn't really matter. Just like driving on the left works as well as driving on the right.

Many older cars have positive ground. The direction the electricity flows suggests it's the way to go, anode/cathode. In function in didn't matter much and neg ground became the standard.

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