Voltge
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3rd Gear
Joined: Oct 2022
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From: Alabama
Voltge
My voltage is at 12.4 on the DIC. No battery light is on, but I have verified the voltage at the battery with a voltmeter. Is my alternator toast, or possibly something else. Thanks in advance.
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Not much information here…so you see 12.4 volts on the DIC ??…is the car running or key on ??…what is the voltage at the battery car running ??…voltage at the battery will always be about .3 to .4 volts higher at the battery engine running…what is battery voltage ??…what is the voltage at the alternator B+ ??…do you know how to perform a voltage drop test on the charging system ??
Last edited by C5 Diag; Jul 28, 2024 at 01:38 PM.
Melting Slicks
Joined: Mar 2023
Posts: 2,898
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From: North Coast
The car stopped with no accessories should show around 12.4 or more.
Car running with full charge should be just over 14 volts.
Car running with air and lights around 13.4 bolts give or take.
Has the car been sitting with no tender on it?
Car running with full charge should be just over 14 volts.
Car running with air and lights around 13.4 bolts give or take.
Has the car been sitting with no tender on it?
Last edited by hyperv6; Jul 28, 2024 at 04:31 PM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,435
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From: Cape Coral, Florida
A FLA battery with 12.4 volts is less than 80% charged…a fully charged FLA battery is 12.66 volts…by “car stopped” do you mean engine off or the car not moving ??
Last edited by C5 Diag; Jul 28, 2024 at 02:29 PM.
Melting Slicks
Joined: Mar 2023
Posts: 2,898
Likes: 1,659
From: North Coast
Fully charged 12.6 but used battery’s and most corvettes sitting as much as they do will be found at 12.4 and still start. That is bathe low end where it will still start. Actually it is 75%.
Running 13.4 to 14.5 depending on temp, load and battery
All these numbers can vary a volt or two. The DIC is not always in agreement with a volt meter,
Either way these numbers are with in operating norms. If it is below 10.5 volts batteries especially glass mat batteries get funky and won’t take a charge unless you have the proper charger. This is why so many think their Optima is defective. Generally it is low and they are using the wrong charger.
Get below 12.4 then you may see codes pop up that are not real. It may start and run but the body control module can do some odd things.
Last edited by hyperv6; Jul 28, 2024 at 04:35 PM.
