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Battery gone dead?

jcs44

Well-known member
Joined
Mar 8, 2004
Messages
161
Location
Harvest, AL
Corvette
2003 Z06 Torch Red/Black
I was going to drive her to work this morning, but when I opened the door and no lights came on, I said oh sxxt. I tried the key and not even a click. The battery is over 3 yrs old and the last time I drove it (last week), I thought the voltage was running a little high - like 14.7-14.9V. And this after I had on the charger overnight. Thoughts?? :confused

Thanks,
JCS44
96 LT4 Vert, triple black
 

B17Crew

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Joined
Oct 8, 2002
Messages
1,610
Location
Columbus, Ohio
Corvette
96 LT4 Polo Green/Light Beige Interior
I can’t help but wonder if the batteries charge had gone so far down that a overnight charge would not bring it back from a low level state.

At three years and the C4’s constant draw on the battery, it sounds like a possibility.

Good luck and please keep us posted as to what you find!

B17Crew
:w
 

jcs44

Well-known member
Joined
Mar 8, 2004
Messages
161
Location
Harvest, AL
Corvette
2003 Z06 Torch Red/Black
Well, I had it on a float charger that turns off when the battery is charged. I did notice that it took longer than in the past.

JCS44
 

B17Crew

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Messages
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Location
Columbus, Ohio
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96 LT4 Polo Green/Light Beige Interior
Hmmmmm...

I had a similar thing happen to me with my original battery.

Although my battery was about 5 years old. I left my Battery Tender off for a week though. I went to turn her over and I got nothing, not even my courtesy lights were illuminated.

One of the C4 guru’s will chime in here soon to lend a hand.

B17Crew
:w
 

354RwHpLT4CE

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Joined
Oct 14, 2003
Messages
120
Location
Memphis,TN
Corvette
1996 LT4 CE Coupe
battery

14.7 volts after charging is ok.Just curious,are you sure the alarm didn't go off?I have had that happen to me before,Came out after work and she was non-responsive.After removing key,and shutting the door....clunk,the doors locked and the dome light came on. fired right up.Alarm just needed to reset with the key fob present.Wife also likes to leave the dome light on,that will suck it down.Just ideas.Let us know.;shrug :beer
 

Stallion

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Joined
Nov 20, 2002
Messages
2,305
Location
Jersey
Corvette
1996 CE LT4
...and the C4’s constant draw on the battery, it sounds like a possibility.


What draws current when the car is off on our C4s?? I'm guessing some function of memory for the ECM, but what else? That shouldn't be drawing much at all, no?
 

B17Crew

Well-known member
Joined
Oct 8, 2002
Messages
1,610
Location
Columbus, Ohio
Corvette
96 LT4 Polo Green/Light Beige Interior
What draws current when the car is off on our C4s?? I'm guessing some function of memory for the ECM, but what else? That shouldn't be drawing much at all, no?

The factory alarm is a constant draw on the C4.

B17Crew
:w
 

jcs44

Well-known member
Joined
Mar 8, 2004
Messages
161
Location
Harvest, AL
Corvette
2003 Z06 Torch Red/Black
OK, got it fixed. That battery was stone cold dead and would not register anything on a volt meter. So I guess it was shorted or open internally. Anyway, new battery solved the problem quickly and all is normal. One question though: What should the volt meter be reading when all is normal?

Thanks, JCS44 :) :) :)
 

6speeder

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Jul 30, 2003
Messages
153
Location
santa cruz, ca
:...... What should the volt meter be reading when all is normal?..............

In theory, a 12V battery will register 13.2V static when fully charged (2.2V per cell).

Normally, a battery will register 12.0+ static, and 14.0+ dynamic (depending on accessories in operation).

At start-up, 14.7 is normal, even with a fully charged battery. After a few minutes, the reading should return to 14.0+.
 

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