14.6 volts is not high you are fine
normal range for an alt is 13.5-14.5
if it was more like 15-16 volts I would worry but for it being “very high” it is not I would say you are fine
as for the battery light check for any loose connections on cables clean the ground with a wire brush and some simple green
the service lights are reset through a pin in the diagnostic connector located in the engine compartment it is a 20 pin connector that you have to use a scan tool but I am not for sure if the battery light is the same I assume it is. I know that pin 14 on the diag.connector is for the battery.
in short take it in have it cleared
EDIT: the regulators in most all of todays alts.are internal and when they are rebuilt they come with new voltage regulators.
you have to take the back of the alt. off in order to get to it.
it is not a DIY job anymore unless you have a decent amount of electrical exoeriance.