Battery goes dead.
Thread Starter
6th Gear
Joined: Dec 2012
Posts: 6
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Battery goes dead.
I have a 2007 C6 Manual Ragtop. The battery goes dead after just a few days in the garage. (sometimes)
First thing I did was check the charge voltage. All is fine there. Then battery base voltage and it was 9.7 (disconnected and left overnight of course) so I assumed a bad cell and replaced the battery. (I went slightly larger) I figured that was the end of that issue. To my surprise a couple weeks later, it happens again. Then a week or so later, again. I'm not certain but this seems to be happening intermittently. I haven't pinned down a maximum time to be at idle or other such variables as of yet.
I'm just about to begin the long process of tracing for something not shutting down so I thought I would browse the forum for known issues. but then I saw a post on this forum that C6's are known for this when not left in reverse. I have to admit that I do often leave it in 1st gear. Is this for real ?? I've never heard of a battery going dead due to the gear selection.
Thanks in advance for any pointers.
First thing I did was check the charge voltage. All is fine there. Then battery base voltage and it was 9.7 (disconnected and left overnight of course) so I assumed a bad cell and replaced the battery. (I went slightly larger) I figured that was the end of that issue. To my surprise a couple weeks later, it happens again. Then a week or so later, again. I'm not certain but this seems to be happening intermittently. I haven't pinned down a maximum time to be at idle or other such variables as of yet.
I'm just about to begin the long process of tracing for something not shutting down so I thought I would browse the forum for known issues. but then I saw a post on this forum that C6's are known for this when not left in reverse. I have to admit that I do often leave it in 1st gear. Is this for real ?? I've never heard of a battery going dead due to the gear selection.
Thanks in advance for any pointers.
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
The "leave in Rev for shutdown" applied to '05 M6's ONLY.
If you didn't already see it here's a long and pretty informative discussion on power off battery draw. The good info starts at post 77:
http://forums.corvetteforum.com/c6-c...-syndrome.html
If you didn't already see it here's a long and pretty informative discussion on power off battery draw. The good info starts at post 77:
http://forums.corvetteforum.com/c6-c...-syndrome.html
Thread Starter
6th Gear
Joined: Dec 2012
Posts: 6
Likes: 0
Thanks Rick. That gives me a very good head start.
In fact reading through that thread made me remember how (on occasion) when I would forget my cell phone plugged in, I would walk into the garage (to get a beer or whatever) and I would hear the cell phone (out of the blue and sometimes repeated several minutes later) say "Charging" As you probably know, this phone warning happens at the moment power is being applied to the phone. Once plugged in, no more warnings normally. I never thought much of it. FWIW I wonder if this isn't a clue that the power to the accessory module is going on and off. Of course, once this battery problem started I stopped leaving the cell phone in the car.
Anyway, I just thought I would pass that on to you.
Thanks again for the lead. I looked all over the forum and had not run across the one you pointed out.
In fact reading through that thread made me remember how (on occasion) when I would forget my cell phone plugged in, I would walk into the garage (to get a beer or whatever) and I would hear the cell phone (out of the blue and sometimes repeated several minutes later) say "Charging" As you probably know, this phone warning happens at the moment power is being applied to the phone. Once plugged in, no more warnings normally. I never thought much of it. FWIW I wonder if this isn't a clue that the power to the accessory module is going on and off. Of course, once this battery problem started I stopped leaving the cell phone in the car.
Anyway, I just thought I would pass that on to you.
Thanks again for the lead. I looked all over the forum and had not run across the one you pointed out.
Drifting
Joined: Feb 2012
Posts: 1,592
Likes: 95
From: Warwick Rhode Island
think about replacing door pads they will drain your battery as they will wake up the a bunch of different modules, door control module body control module.... they are only 12 dollars each
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 461
From: Southern Utah
The power to the accessory plug is on all the time, it is not shut down by the computer. You need to start by checking the current draw at the battery. After a few minutes, it should settle down to 15-25 ma. If it is higher, then you need to start pulling fuses to find the drain.
Thread Starter
6th Gear
Joined: Dec 2012
Posts: 6
Likes: 0
Thanks Black.z51.c6 and cclive. I am going through the process as I write this. I will post a detailed finding when completed. Made a fix, letting the battery charge overnight, then I will monitor, log results and post accordingly. Thanks again.
