alternator belt slack/slipping?
does the voltage go up when you rev the engine?
possibly your battery is duff. if it has a bad cell then this will be a 'blockage' in the circuit causing a restriction in the amount of charge coming out of the alternator.
either fit a new, or a known good battery and recheck voltage. ORRRRRR if you have a second car and some jumpleads connect leads up as though you are going for a jumpstart, but dont start both cars. just check the voltage in either battery and then start your poorly car up and check voltage again, if alternator is good the voltage will show 13.5-14.5v going into both batteries. (this is just bypassing your duff cell and confirming the alternator is ok, and the battery is the problem. if you still get 12.6v it may be the alternator or wiring issue)
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