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I would first test the charging voltage with a voltmeter, if you have access to one. The regulator can be adjusted, which is a good place to start. The generator light was on in my 70 Chevelle when i bought it. The voltage at idle to redline was a constant 11.7 volts, so it wasnt charging at all. You should read around 13.4-14.4 volts at idle. I later found the alternator wiring was destroyed inside, and my regulator was fried. If you're not charging and adjusting the regulator doesnt work, I would replace the regulator first. Sometimes you need to adjust the new regulator, it took me 2 weeks to figure this out.....
Theres many tests you can do to test the alternator and the regulator, but i think most parts stores will test you're alternator for free for you, which is also a good place to start. Also clean and tighten all connections to the alternator and regulator, including connections to the horn relay.
If you need more help or pics just let me know...
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