Couple of reasons, one is regulators now days are made for pos and neg ground systems. Years ago they were polarity specific. Points on neg and pos terminals were made of different material and or hardness, now they are the same. Second thing is actual current flow through the field windings and therefore through the regulating points. Over the years IH used at least three different generators, depending on weather or not you had a regulator or high low light switch controlling the charge. Most manufactures of rebulilt generators have a one fits all,(and it doesn't) for all H and M's and supers etc. For that reason and many others I hate rebuilt generators. Used to repair them but you cannot get correct field coils now days so one is stuck with what you can get. I had a specification manual from delco remy at the dealership and it listed every generator delco used. Lot of difference. Don't have it anymore. If you do a current draw test on the fields and they pull over 2 l/2 amps you will never keep points in regulaltor very long. Some 3rd brushs are adjustable and if you set them too close to main brush you will impress too much voltage on fields and cause them the draw too much current also. A shunt wound generator (two brush) is a superior generator and was used on later model tractors like 450's and used same regulators. I have adjusted hundreds of regulators over the years and it can be very frustrating when you cannot get a nice steady voltage setting due to incompatable parts.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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