Dano523

Easy way to test, just pull the Onstar fuse in the kick panel when you park the car, and see if the battery drain problem goes away when it's parked for a few days.

cgladish

I'm sure everyone has different issues resulting battery life.
my initial one was the passenger seat adjuster was stuck.
it kept cycling and would drain the battery after one day.
once I figured it out, 1-1/2 years later, no problem.
but I also have an issue with the negative cable.
It has come loose twice while driving. go to start, nothing.
I can't get the terminal tight enough though. I can still work it loose by hand. for now, I get it as tight as I can, then twist it bit to help it seat better.


good luck!

Corvette_Ed

Do you have the correct nut for the terminal? If not, it will do exactly what you're saying.

cgladish

I haven't checked. had the car since jan / 2017, bought from the original owner. it's not been a big deal, but i'll put it on the list.


thanks!

SHM

Make sure if you have any connected accessories that they're all turned off or unplugged. Also make certain the interior lights actually go out after you close the doors. These cars do have a 10 min power saver delay. If you leave something on or leave a door open for more than 10 min, the BCM will cut the power.

Otherwise, if you have anything drawing too much current, best to disconnect the '-' battery terminal and connect a DVM in current mode to the terminal and the other lead to the cable. If there's more than a few milliamps of current draw, something may be drawing too much power. Just make certain no light is on with the hatch up. From then, it's going fuse to fuse to measure current draw until you find the circuit that's the power hog.

Jimmy W1

I didn't read the whole page but first things first. When you bought the new battery did you charge it completely? People think that new batteries are charged up but sometimes they aren't. I ALWAYS charge a new battery until my trickle charger says that it's fully charged.

Jimmy W1

2nd this. Alternators aren't like the old generators. They won't pick up (charge) a dead battery. You should charge it for several hours when you buy a new battery. Preferably overnight.

SHM

That's what I just did. I replaced the battery, then immediately connected the tender. When the tender showed a full charge, I started it and drove it for about 45 min. Hopefully, I broke in the new battery in the best possible way...

Cherokee Nation

Before you leave the place you brought it at...Make sure of the born on date and have them charge it fully to around 12.6 volts.

NOWUCME

Simple answer, GM engineering. Never had a problem with any other car like a Vett. They even have a bulletin out on the vette and cadi 05-07 for a parasitic draw because they programed it wrong supposedly on the automatic door lock setting. Won't tell people, most of the dealers probably don't know the fix, and they won't reprogram free...they charge for their own admitted mistakes. Got to live with it if you want a vette, one thing or another. Some get lucky others don't. Some depend on how it's been taken care of and driven. Then they put that stupid switch for the map lights so if you just nudge it your battery is screwed if you don't notice they are on.. I use a tender for a couple days or anything longer.....never have on another car in over 50yrs of owning many many...jmo

Scuba Ghost

Time to trade.

Cherokee Nation

[QUOTE=Jimmy W1;1596743801]2nd this. Alternators aren't like the old generators. They won't pick up (charge) a dead battery. You should charge it for several hours when you buy a new battery. Preferably overnight.

[/QUOTE Wrong: I've charged my battery on my vette and my classic car many times after a jump start.is that not what the alternator is for....I remember back in the day when i had a lot of used cars with the generator and a 6 volt battery and to get a charge i would have to run the engine at a higher rpm. Not all of us have a battery charger.Would not do any good anyway,because i live in a apartment with covered parking with no ac power.

03CARISMA

Same issue. I just replaced the battery in our "13, but the first replacement battery was dead after a few days--long story, no parasitic drain, but bad battery. The second one seems to be working well.

SixAddict

This is true. I've had mine go dead in a week by forgetting to "open" flaps.

Jim2003

I have a 2013 sits in my heated 4 car garage. It has sat for better than 3 weeks and it fires right up. My 2003 could sit for that long and would have no problems starting it.

I feel you have a draw on your battery. As an example; I have my 68 Camaro (I am the only owner) in the same garage. When I park it, I discount the negative post on the battery. I had to replace my battery last summer, after 16 years on a auto zone battery. Old cars have drains due to shorts in old wiring. So I beat the system by discounting the negative.

Now we can not really do this with our vettes, but you could use this as a trouble shooting method to prove the car drains the battery and that the battery is not bad.

Good Luck in trouble shooting !

LS WON

How about dirty battery terminal connectors? My battery went dead (7 yrs. old now and 2nd one). Tried to jump it no success then I cleaned the terminals and it started right up after jump. But a week later battery dead at 10 volts....
Autozone did a free battery test that says it's 99% good and charging system works fine.