How To Read A Voltmeter In A Car. I start the car it pops to its usual position and sits. A fully charged battery should read about 125 volts when the key is in the ignition and turned partially but the cars engine is not running.
As for the vehicle volt meter it should read somewhere over 12 VDC preferably 13 to 14 VDC as they are NOT as accurate as a DVOM. Place the black lead on the negative post and red lead on the positive post. Lets check your car battery with a multimeter.
Cars operate on a 12-volt electrical system.
Note that before installing it Mike silkscreened the ammeters gauge face to read 8 to 16 volts in the Road Runners stock font. Modern car systems may wake up when you connect a multimeter in such a fashion as it picks up the power of its batteries. Now drivetrains are shot through with electron-driven devices. Move the earth lead to a point on the car body and take the voltage reading again.
