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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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