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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that�s wha
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