Your alternator is dead!
The red light means the battery is low.
The red battery light indicates that the battery is not rceiving sufficient charge. Look for a loose belt or loose/dirty battery cable connection, or have the alternator and/or battery checked.
Disconnect the red terminal on battery and let it sit for 15-30 minutes, reconnect the battery and check engine light should be off because the computer has been reset.
A red light means your DS is running low on battery, and needs recharging.
If it flashes red it means it has low battery, if it flashes green it means the battery is okay!
generally speaking, there are several LED lights on the battery charger, when the light is red, it meas the battery is being charged, when the light turn to green or yellow, it means the battery is full charged
a red flag would still be red in a red light.
A red flashing light on a Droid usually means that your phone has 15% or less battery left and is about to die!
That it needs to be charged or is running out of battery.
usually shows low battery....
Red is positive black is ground.
A blinking red light is the adapter's way of informing you of a low battery.