The optimal power of bulb is 21 W and nominal voltage always stays at 12 V. It keeps you driving 4.0 engine vehicle produced in 2001 safe on the road. Provide and check optimal output of back lamps in Ford Explorer 4.0 for safe drive. To replace the lamp in Explorer you need exactly BA15S type of lamp. Every car on the road including Ford Explorer must have backup lights working.
If you want to repair backup light in 1998 Ford Explorer, it’s better to contact the service. But first buy BA15S type of bulb with optimal voltage 12 V. Disassembling the rear lamp in Explorer 4.0 is needed to change light bulb in Ford car.