14 volts +/- 0.2 volts means sometimes it is as low as 13.8, which is too low.
Everyone seems to have forgotten that there is a third component in charging system, the voltage regulator. It is bolted on to the back of the alternator, where the harness plugs in. This problems sounds like it could be in the regulator or one of the connections.
Here is something you might want to try, but, for safety, first disconnect the ground write from the battery. On the back of the alternator, there should be one heavy gauge wire connected to a post and then a connector with 4 or 5 other wires. Make certain the heavy wire's connection it tight. If it looks dirty/corroded undo the connection (this goes directly to the plus side of the battery so now you understand why I told you to disconnect the negative !), clean it (brass toothbrush), reassemble and apply some silicone dielectric grease.
Remove the other connector. Inspect the pins for signs of corrosion. Clean, apply dielectric grease and reassemble.
Make certain the regulator is bolted on tight as well.
last, reconnect the battery ground cable.
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1998 E150 Club Wagon, 4.6L Modular, E4OD
2007 Milan. 3.0L Duratec, Aisin 6 speed AW-F21
others I look out for
2007 Escape 2wd (the mini Pumpkin), 3.0L Duratec, CD4E
2008 Mazda3 5 door, 2.3L, 5 speed manual
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