You really s/b seeing 13+ volts if the battery is healthy. 6 wet cells, each producing about 2.2 volts wired in series.
If the battery is hooked up and the car running, you s/b seeing 13.5-14.5 volts for the oem bosche alternator.
If not, check cables for resistance and load test the alternator and battery. As mentioned, several parts stores will do this for free.
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