Like Allan suggests it's likely the new batteries simply need a good charge. Running the engine at speed for a couple hours (or leaving a charger on 'em overnight) should top them off and cause the ammeter to run near center within a few minutes after startup.
However your system voltage of 14.7 is a little high on the high side - especially for hot weather. If the ammeter does NOT taper off and the charging voltage remains 14.4 volts there's a problem with the regulator or regulator sense wiring. You'll need to find and correct the cause or risk frying your new batteries!
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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