On a drive yesterday, I notice the turn signal blinking slowly and A/C isn't putting out. The Check Guages comes on and sure enough, voltage is deep in the red. Then the ABS and Traction Control go out. Seems like it's shutting down unecessary systems to preserve battery power.

I had the shop down the street do a start and charging test. They pronounced the battery DOA. So I got a battery, threw it in, and according to them it passes the test.

I'm still not sure. On the drive back I watched the voltmeter closely. With A/C and stereo on, it's reading just above the solid red line between 8 & 13 volts. That's right around 11 volts. With engine off and key in run position it reads maybe 12 volts. For a moment while driving stayed at 14 volts, but only for maybe 10 seconds.

Owner's manual says to worry only if it goes below 11 and stays there. It's borderline and making me uneasy.

Picture for reference.