Bosch introduces a new, high-amp School Bus Alternator to meet the power needs of school buses with multiple accessories (Bosch part #s AL9962SB and AL9963SB). Featuring Bosch’s exclusive Self Protection Regulator that reduces output when under hood temperatures climb to 125 degrees Celsius, the alternator allows the output to return to normal when the temperature drops back down. Most other alternators fail at slightly over 110 degrees Celsius under hood temperature. Comes with Bosch's 24-month, 200,000-mile warranty.