It would help if you gave us a little information, like what combine(year and model) and what brand /type alternator. It is very important to know this to give you any info that is not just a wild guess.
A 1 wire Delco alternator, if that is what you have, should excite at the high rpm most combine engines run, but if it does not, no need to replace it. A 1 wire delco SI series allows you to wire it exactly as a stock 3 wire Delco SI series IF you need a charge indicator light or need it to excite at lower rpm. They operate the same when wired as a 3 wire system.
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Today's Featured Article - Self-Starting Tractor - McCormick 10-20 - by Francis J. Robinson. I remember it very clearly even though it was almost 50 years ago and I was only about seven years old. My Dad had purchased a new Ford-Ferguson tractor and basic set of implements when he started farming just about the beginning of W.W.II. It was considered a pretty nice outfit for their 70 acre central Indiana grain and livestock farm. Dad spent several years during the war testing aircraft engines at Allison Engineering in Indianapolis working seven days a week on a twelve hour night sh
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