Should alternator be putting out 13-14 volts?

The charging circuits in these cars are very simple and easy to diagnose. If your mechanic is stumbling, you might take it to an auto electric shop. Of course, you could do all yourself if you read the gazillion posts on this here.

Until then, you might use a charger to keep the battery up for short trips, or jumper wire it for "full field" if you must take a long trip. Monitor w/ a cigarette lighter voltmeter and disconnect the "full field" when it reaches 13.5 V.