Have checked the ground, new regulator2 and alternator
Get another battery test battery voltage should be 12v start your engine test again should read 14v any figure above 14v is dangerous note some batteries has negative effect on alternator output.
SOURCE: alternator putting out 16.5volts
or and more likely... the voltage regulator either mounted on the alternator or on the wheel well is defective.
SOURCE: voltage problem on 91 Buick Park Avenue
sounds like the voltage regulator is not working, at the terminals you tested voltage should be above 13.6,also make sure you have good grounds,these should be tested with an ohm meter,meter should read zero,no resistance, if you need more help get back to me and we'll do some other tests,please rate my fix as i strive to be the best
SOURCE: 12 volt alternator putting 24 to 48 vols
Try another multi-meter or change the settings... 12V alternators cannot produce 48V.
SOURCE: 2006 Ford Tarus Over Charging from Alternator
Could be a pinched wire that did not show up when new. May have worked thin over the years.... Though to locate at times..... Bulk head headers can be a culprit, any where a wire passes through or over metal parts. Check for corrosion near battery terminals and alternator as a corroded connector can be "seen" as a resistance to the alternator and it will output more amps to compensate.....
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