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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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