The bigger alternator makes more amps at low RPMs. That's the main reason why many new autos come with 150 amp alternators. It's not to make 150 amps. It's to make 50 amps at engine idle speed so when stopped at a traffic light or stop sign - and the AC and stereo and headlights are on (and other loads) -the thing keeps charging.
Farm tractors often have different pulley ratios then cars and the alternators often run slower. So a tractor with a lot of electrical loads can benefit a lot from a larger alternator. All depends on what you want to do. We had a Deere tractor with a 37 amp alternator at the shop. The farmer was trying to run a 8 row corn planter with it and each row drew 7 amps of power. I.e. 56 amps all the time. We had to stick a Leece-Neville 160 amp alternator on for him.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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