Low Voltage Warning Light

[Rez]

I found a schematic for a low voltage warning light system. Two LEDs come on when the voltage drops below a given amount. This is good because the car wouldn't suddenly stop when the voltage dropped. In stead you could finish a lap or drive to the "pits" or what have you. It should be fairly simple to modify this circuit to a cut off if that's what you want. Check it out

http://homepages.paradise.net.nz/bhabbott/lvw.html