The slow drop in battery voltage from 12.75 to 12.5 volts after turning the engine off is probably normal. As is the 14 volts with the engine running. My Corolla does that same thing, same numbers in fact. On the other hand, when you connected a fully charged battery measuring 12.7 volts to the car and the voltage immediately dropped to 12.25 volt, that isn’t normal. It sounds like you’ve isolated the problem to the CD player. Good call. Hope you have it resolved now. If not, there are fairly easy to do tests to figure out which circuit(s) are draining the battery.
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