'85 Eldorado - Electrical...still

I still have the same problem... here it is:
'85 eldorado drains battery AFTER engine is hot and / or Overheats.

Alternator puts out 12.79 or more
Battery reads 12+
Then when hot drains to 10.5 in matter of minutes.

New Interstate Battery
New 100 Amp Alternator (several)

Ideas?

You have a drain somewhere. Check all the circuits for power drain when the car is off.

my friend has a drain also , the power antenna was running all the time when the battery is hooked up he unhooks the battery for now until we can get together and replace the antenna I wonder how hard that will be LOL