Rick's Free Auto Repair Advice

Dead battery symptoms

Dead battery symptoms Lights dim, warning lights flash, car stalls

Happened to you? That’s the sign of a dead battery. Normal battery voltage should be between 12.25 and 12.75 volts. You need that much to start a vehicle. But if the alternator isn’t working and the battery starts to drain, voltage falls. Once it goes below 10-volts, strange electrical behavior starts. In fact, the computer will shut off completely at 9.6-volts.

So before you start looking for shorts or bad ground wires, charge the battery and then check the alternator. Click here to see how to do that.


© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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