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tony, the 12.5v would be correct, but useless. voltage readings mean nothing when looking for a drain.
you said you removed all the fuses but still had VOLTAGE, you cant troubleshoot checking voltage. you need to do this again checking current or either use a test light.
if the same results, you still a big current draw, remove the battery cable at the starter, this powers the alt.
you only need a very small amount of current to read 12v. i dont know how small, but even .25a would measure 12v.
(i am an electronics tech for the FAA and i worked at an auto electric repair shop for a short while).
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