v70 Alternator problems

I have just bought a 1997 v70 with 227000km - in excellent condition. I left the parking lights on for 11/2 hours and the battery went flat.
Mechanic checked battery and said it is nearly dead, but the alternator is only charging at 12.7volts, and needs something done about it. The previous (and only other) owner said he had had the alternator replaced twice. Should we be looking somewhere else for problems. My 240 did 320000km before the alternator needed replacing, not that I would swap this for a 240, just trying to find out what the go is.
Thanks Jeff
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tell your mechanic to first replace the battery then recheck the charging system a battery that is bad will give a false voltage output reading from the alternator if after replacing the battery & the alternator is still not charging you should either have your local Volvo specialist look at the car or have the Volvo dealer look at the car
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