MY 2002 IMPALA, WITH THE 3.4 ENGINE HAS HAD THE BATTERY LIGHT ON FOR SEVERAL MONTHS. ALTERNATOR TESTS FINE, BATTERY DID TOO, BUT WAS MARGINAL SO I REPLACED IT. THE CAR IS CHARGING 14.3 VOLTS, WITH MINIMAL LOADS, AND 14.2 WITH EVERYTHING ON. STARTS RUNS AND DRIVES FINE, BUT I DONT TRUST IT. MY LOCAL DEALERS CANT FIGURE IT OUT. I HAVE FOUND THAT DISCONTECTING THE GROUND FROM THE BODY TO THE NEG TERM ON THE BATTERY WILL CAUSE THE LIGHT TO GO OUT BRIEFLY, SO I REPLACED THE CABLE. NO CHANGE, I ADDED SEPERATE GROUNDS TO THE BODY AND THE MOTOR, WITH NO CHANGES. ANY SUGGESTIONS???