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car won’t start without jumper

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Old Jan 9, 2025 | 01:14 PM
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Default car won’t start without jumper

i got a new battery may 2024, and now my c4 won’t start without a jumper. the car drives fine with everything working just fine however sometimes my security light flashes whenever i try to turn over? i noticed it this morning. my voltage reads 16 volts consistently. i’m thinking of my battery is going bad but i just can’t believe it cause it’s brand new.
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Old Jan 9, 2025 | 01:25 PM
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New doesn’t always mean good
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Old Jan 9, 2025 | 01:28 PM
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had same problem there was a dead spot in new starter
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Old Jan 9, 2025 | 01:36 PM
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bad ground/positive connection somewhere?
I hate electrical issues...
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Old Jan 9, 2025 | 02:16 PM
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Do you have a voltmeter to watch the battery voltage - at rest and during cranking?
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Old Jan 9, 2025 | 04:23 PM
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Originally Posted by marshal.com
i got a new battery may 2024, and now my c4 won’t start without a jumper. the car drives fine with everything working just fine however sometimes my security light flashes whenever i try to turn over? i noticed it this morning. my voltage reads 16 volts consistently. i’m thinking of my battery is going bad but i just can’t believe it cause it’s brand new.
Bolded text may be a VATS issue. Have you tried cleaning the pellet on your ignition key?
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Old Jan 9, 2025 | 05:01 PM
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If your car is charging at 16 volts, I am not surprised your battery has gone bad in that time.
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Old Jan 9, 2025 | 08:19 PM
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Never mind. OP has a 1992. I wrote a response for an 84-89.

Last edited by IHBD; Jan 9, 2025 at 08:25 PM.
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Old Jan 10, 2025 | 10:08 PM
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havent thought of that, i actually made a new post as i forgot about this one.

https://www.corvetteforum.com/forums...fter-jump.html

it flashed intermittently. I think i fried my battery.
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Old Jan 11, 2025 | 11:42 AM
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What volts does the digital say? 16 is too high should be 14.3-14.7 or so.
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Old Jan 11, 2025 | 12:32 PM
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The gauge in the OP's pic in another thread is in the position for normal charging voltage. About 14.0. "16 Volts" is the far top of the scale. In the pic, the needle isn't even close to "16". Another indication of in-range voltage is that the CHECK GAUGES light is not on. If the system is over-voltage, it would be.

Question for the OP: When it won't crank, Does the SECURITY light flash in groups of 3 along with a SYS message in the speedo?

I also note that the car has 191,000 miles on it.



Last edited by IHBD; Jan 11, 2025 at 12:37 PM.
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Old Jan 11, 2025 | 02:49 PM
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The OP said it was 16, I would think he got that from somewhere. I was talking about the digital readout you can bring up, that will have a precise number.
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Old Jan 11, 2025 | 07:40 PM
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Originally Posted by AftonJay
The OP said it was 16, I would think he got that from somewhere.
It looks he got the "16" from the analog gauge, as that is what he put a picture up of.

Originally Posted by AftonJay
I was talking about the digital readout you can bring up, that will have a precise number.
I know what you meant. I'm not sure the OP knows about the "GAUGES" button. Plus his LCD looks like it has bad polarizing film. He may not be able to read the gauges readout, or the gauges legend in the odometer area..
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