62 Valiant 200 / 170 cuin /6 - Odd smell - then dead battery

Mattax said

So it seems the problem is with that regulator.

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If you have a multimeter that can measure up to 10 amps, it would not hurt to do the field current draw test that @67Dart273 mentioned.
A possible reason for 2 or 3 regulators to fail is an alternator with a high current draw.