That is one way to approach the biggest problem with automotive alternators when running under larger loads. It's pretty easy to build a 10SI alternator to put out 140 amps but if they are used at that output for more than a couple minutes they will fail. A 40SI alternator may have the same output but they use three sets of rectifier bridges to spread the load to help keep them cool.
If you need a 10SI type alternator with a higher output you should consider the 12SI series. It has the same size case and mounting but uses a more efficient fan and larger cooling vents.
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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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