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Just pulling a cable off the bat will only let you knw a little bit. Your engine only needs a few volts and a couple amps to run. But the battery needs more than that to charge up and also running all the stuff like headlamps.
Take your multi-meter, and hook it to the batery. Set the tester to Volts DC and to the lowest scale that is over 15 most likely that will be the 100 volt setting.
Start the engine and rev it up a bit to kick in the one wire alt and make it start charging.
Look at your meter, anything over 13.4 or so is good.
Anything less than 12.5 and your not charging at all.
Anywhere inbetween those two readings means you are charging...but not enough.
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