"In all my years I have never done this after replacing battery... Should I??"
Like Steve told you its "usually" NOT necessary but it doesn't hurt to be on the safe side, especially if the genny has been repaired or replaced or perhaps sat unused for an extended time period. In cases where you change polarity of course it MUST be done then. On many Genny and Voltage Regulator set ups its accomplished by using a jumper wire to momentarily flash jump from the BAT terminal on the VR over to the GEN/ARM terminal (or direct to the ARM post on the Genny) and you should get a small spark. Theres little chance you needed it over the years simply because you replaced the battery, not to worry mate !!! It imparts a degree of magnetism into the soft iron field poles in the correct North South magnetic polarity so it charges in the correct + and - electric polarity.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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