This light will come on briefly when the ignition is turned to ON to show that it is working.

It should turn off once the engine is running. If it stays on, or comes on while you are driving, you may have a problem with the charging system. It could indicate that there is a problem with the generator, generator drive belt or another electrical problem. Have is checked right away. Driving while this light is on could drain your battery. If you must drive a short distance with the light on, be certain to turn off all unnecessary accessories, such as the radio and air conditioner.