Not trying to be a jerk, but my first suggestion is to get a copy of the 301A Technical Manual (JD #TM1088). I have the manuals for my JD equipment, and they have the wiring diagrams and a number of diagnostic tests with what you should get for readings from them; I expect the same type of info is in the 301A TM.
Does it have a Motorola alternator as original? Are the plug-in connectors still on the harness and regulator?
When you had your test light hooked in series with the battery and negative cable, did you unhook the wires from the alternator's output (battery) terminal and see if the light went out? That would be an indication of a bad diode(s).
Did you check the voltage across the battery with the engine running about 1500 to see if it is charging and at what voltage?
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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