1997 Ford Aerostar Owner's Manual - Page 16

Electronic 4-wheel drive warning light Charging System Light This light indicates that your battery is not being charged and that you need to have the electrical system checked. Charging system light This light illuminates every time you turn the ignition to the ON or START position (engine off). The light should go off when the engine starts and the alternator begins to charge. If the light stays on or illuminates when the engine is running, have the electrical system checked as soon as possible. Supplemental Air Bag Readiness Light and Tone Generator This light illuminates for six seconds when the ignition is turned to the ON position. If the light fails to illuminate, continues to flash, remains on, or if a series of five beeps is heard, have the system serviced as soon as possible. 13