Also, you mention having amp and subs - you have disconnected them you say. How were they connected and are they really really completely disconnected? What other aftermarket electronics are installed? How are they connected and switched?

These will be good things to check with your ammeter as well.

The battery is a duralast gold specifically made for underseat applications. It's got the vents connected. It has 140 reserve capacity, 1000 CA and 840 CCA. Only a month old too. I've disconnected all audio equipment wiring (everything is directly connected to the battery and fed off that) quite a while ago. I'm 100% positive that it's not the issue. As I said before it was doing this before I put the stuff in. I also ran this stuff in a 1990 Buick Park Ave that had a crappy battery and a weak alternator with no issues.

Here's another update on the situation. I last drove the car about 6 hours ago. I went out about 30 minutes ago and the battery was just about completely dead. Just had enough power to turn the lights on and make the starter click a few times before dying out. Now the car can sit for literally 8 hours during the day and not have a problem starting. I last drove it about 45 minutes before parking it around 6PM. So the car sat about 6 hours and was dead when I went out to start it 30 minutes ago. The only difference between starting it in the daytime and when I parked it at 6 was the fact that the auto lights had just come on. That's the only variable that I can see that's even remotely different.

Let's go back to the beginning. The Duralast is an AutoZone product, correct. Then bring the car to them without back seat installed and have them load test battery and confirm that your "new" battery is indeed capable of holding a charge and your charging system is putting out the correct amount under load also.
We've been assuming just because it's a new battery that that isn't the issue, but it could be. Also you said you checked the output of the alternator using the voltmeter on your jumpbox. Not a reliable charging system test in my opinion. And even if you used your small voltmeter, the one that fried because it was hooked up "Too Long", I wouldn't trust any reading you got from that voltmeter either.
My recommendation is to go back to the basics and start off knowing the major components in the system are good. Battery and Alternator (charging system). These tests are free at AutoZone or any of the chain auto parts stores.
It won't take long to do this and you'll be sure you are starting your troubleshooting at a known Good point. Who knows maybe one of those guys might see something you missed. Highly unlikely, but even a blind squirrel can find a nut now and then.

I would also recommend having the battery retested. It needs to be fully charged before they test it, but what you are describing sounds like a bad cell to me. I'm guessing this style battery sees a lot of shelf-time in the stores.

How many volts do you have with the engine running? With the car off? Then disconnect the battery - How many volts are at the battery? What about after an hour (still disconnected)? Then hook the battery back up - now how many volts at the battery?

I'm just probing for proof that it's a drain and not a bad battery. But the ammeter will tell you this information better.

Kyle,
Take Derek's and Rick's advice...bring the battery back to where you bought it and have it tested. I bought one each from both AutoZone and Advance Auto last year for each of my Rivieras and both turned out to have a bad cell. Originally, I thought it was just the electronics design of my 92 Riv's which are known to have high parasitic drain. My recommendation to to buy exclusively/only an Interstate battery.

I've sold Interstate batteries in a previous life and had very good luck with them. Very low failure rate. I think I had 2 in a years time and we sold a lot of batteries and installed a lot of them. Used Interstate exclusively. The only times I couldn't install an Interstate was on some very old / vintage vehicles
Highly recommend them and the company took back the bad ones with no arguing.

Thanks guys. I'm going to do that monday. I think this is a combination of a few issues honestly. It's just funny that whenever I disconnect the IP/ELC fuse it starts right up in the morning. Although what's also funny is when I first got the new battery it wasn't doing this then it started again. So it could be the IP/ELC circuit is drawing just enough amperage to drain a already bad battery that may also not be getting a correct charge from the alternator.

I refuse to use interstate batteries. I've honestly had better luck with Duralast. The last three interstate batteries in all my cars developed major issues after only a few years being able to hold a charge. The one in this car was an interstate and it smoked and hissed when you tried to charge it. The date stamp on that was only one year. Speaking of date stamps, I checked the stamp on this duralast and it was produced in july of 2009, so it's not too old at all.

Oh and today the car developed a new problem. The signal stalk wiper control doesn't work. The only way I can use the wipers is to press the wash button. Oh the joy....

For such a low mile car you are having your share of issues.

The issues are probably a contributing factor into why the car has such low miles. Wonder if Kyle has a service history on the car - that is, the receipts/description of prior work done on it. Might give us all some troubleshooting ideas.

I wonder how the foglights are wired?

Albertj

As far as Interestate vs Duralast - I reached my fill with crappy parts from autozone, they get the cheapest of cheap. I was never a big fan of Interestate either, and I used to work at a store that sold them. I always got Die Hard Gold batteries for years and years, and they all outlasted their 'life' by several years, but today their quality is not what it was back then. For the Riv I got one from GM. As far as I'm concerned Delco is the only battery I'll put under the back seat...

One of the big issues with different brands of batteries is that there are only like 3 plants in the country that actually manufacture them, so no matter what the brand name is, it's really one of those 3.

I do have to admit that the GM battery that came with my previously owned 1997 Riv lasted over 9 years!! It still had the original battery when I traded the Riv for an Eldo.

For what it's worth i will replace my battery with another AC Delco as well if they still make this battery by the time i need one. The previous owner told me he put a new OEM replacement in before he sold the car to me.
The battery he replaced was the original one to the car from the factory.
He knew because he bought the car new. That's a damn good track record for a battery. I'm sure some of it's extra long life can be attributed to the fact that it is mounted inside the car as opposed to under the hood, but still is quite impressive.