problem looks to be in wiring or inside the regulator, start with easy stuff first
take all the wires off one at a time and clean the connections, one wire is usually underneath the regulator, also clean the regulator mounting base
if that doesn't improve things you have some choices:
1. open up the regulator and clean the contacts inside, the original regulators are pretty sturdy, you can try changing tension on the regulator points but it is delicate job
2. buy a replacement but I keep hearing bad things about the ones you can buy nowadays
3. my redneck way - first take battery out and charge it good, put battery back in
make up a grounding wire with good clamps on each end, after starting the tractor ground that field post, watch ammeter and keep rpms at a point where ammeter is putting some charge back into the battery
after battery is back up to snuff remove the ground wire and go get some work done
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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