Twice in the last week as i went to start my 67 Malibu 283 I turned the key and got nothing. Not enough juice to even power the dome light. Put a charger on the battery for a couple of minutes and it starts. Drove it on and off for three days and it started every time. Put a tester on battery and alternator and they checked out find. Car sat from Monday till today and same problem. Put a charger on battery and it starts and continues to start today. Also checked battery and alternator again and they were fine. What is draining the battery while it sets and what should i check?

This could be anything. Make sure all connections are clean and tight. Next, check all lamps, glovebox, trunk, etc, and make sure they all turn off when they are supposed to, if it's so equipped. From there, you may need to look at either the alternator or voltage regulator. If the car is still using a mechanical regulator, one of the contacts may be sticking, causing a voltage draw. An electronic regulator will cure this. The alternator could have an interal short, and yes, it will still charge normally. A starter/alternator shop will have to check this for you.

disconnect your negetive battery cable connect a test light in series between the
cable and negetive battery post. If the test
light illuminates then you have a draw..remove your fuses one at a time until the light goes out and you'll know what circuit its on. If none of the fuses removed
cause the light to go out then as Randy stated the most probable cause is the regulator or possibly a battery which has a
shorted plate.

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best regards
Importtech

I just went through a problem like this with my cousin's 72 El Camino. Hit the key, one click, then nothing. No generator light, no oil light, no nothing.
It was a bad connection at the main battery feed wire. Losing power to the inside of the car. Put on a new wire end, cleaned up the connection and problem was solved.

I seem to remember someone on here had that same problem and they had the electric choke on the carb wired up so it was always on, and therefore draining the battery. Another possibility, assuming you have an electric choke.