Battery Drain

[TassiePorsche]

My 04 CTT has an ongoing battery drain issue that seems somewhat inconsistent in how frequently it occurs.
The battery isn't old (replaced late 2021) and is a correct spec AGM. If charged it can last up to a few weeks or a few days before going completely flat and not starting the car.

Some noteworthy items that could be related are;
-Headlight wiring degredation (I've ordered replacements) although doesn't look like there's any metal on metal contact between wires
-Keyless entry inconsistencies - buttons on drivers side don't work but do on passenger side. Also the drivers door sensor doesn't activate until you pull on the handle
-Aftermarket Alpine head unit - This looks like a quality installation but maybe something is awry?

Underfloor wiring is a possibility although I have seen no signs of dampness and there are no weird electrical gremlins to speak of, other than the parasitic drain itself.
I will get the battery tested to verify it is still ok although I feel like given the reputation of these cars it will be a drain and not a battery that has died in short order.

Any suggestions or tricks to try would be appreciated.

[JFP in PA]

Time to run a parasitic drain test, which has been written up multiple times, but there are also a ton of online videos :

.  Basically, after the car has been sitting for about an hour or so, there should be a 45 - 60 milliamp current drain on the battery from necessary things like the clock and the alarm system; any higher than that and you have a parasitic drain on one or more of the electrical circuits.