It's reading 12.3v.
What does it drop to while you are cranking it?
It's reading 12.3v.
He fixed it. Bad batterythe volts dont tell you anything really. With the meter on it, turn the key to start and see what the voltage goes to.
If less than 9, bad battery. Only true way to test battery is with a load tester.
Did you crank it over with the plugs out of it?