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12.6 volts is nominal for a "6 cell" auto battery.
If the regulator is failing you would see the signs you described, but did not observe. If you do a high speed run you may smell some H2S "eggs" and your battery will be very warm. Your fasten seatbelt may come on randomly. And the lights will do as noted.
Check the major ground straps and the leads at the starter. There is also a ground wire from the alternator to the engine block under the shroud that becomes embrittled due to engine heat, so if there is isolation from the fan housing to the chassis you lose that grounding point.
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