Last night was riding around & went to the river. There is an area that is called the beach. It has nice sugar sand. We was riding around & went to turn got stuck. Put it in reverse ended up in the river. The exhaust pipe was about 1foot under water for 30 minutes. We was on an incline so no water was near the motor. After help arrived the truck cut off. Now I can't get it to start. I've checked the oil its clean. Someone told me about an etna (sp) switch to reset. Does anyone know where this switch is located? Its a 99 expedition 5.4L 4x4.