Put the meter on volts. touch the alt body with the neg test lead, and the big terminal on the back with the pos test lead. A reading of battery volts with it connected is correct (not running) Disconnect the big lead. Place the pos test lead on the wire you took off, and the other lead on the post. (not running) if there is more than 0.25 volts (1/4 volt) a diode inside the alternator output bridge is leaking more than it should. if small (tenth of a volt, it is OK. One volt or more will discharge your battery in a few days or less. JimN
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