ATG10553 Alternator for Medium & Heavy-Duty C50 3126 3116 87715398 87715398R 5264312 12715 The ATG10553 alternator is designed for use in medium and heavy-duty trucks equipped with engines such as the 3126, C50, and 3116.It serves as a direct replacement for OEM models 87715398, 87715398R, 5264312, and 12715, with compatibility across various applications requiring a 12-volt system and 200-amp output.Engineered for , this alternator features an internal regulator and cooling fan to maintain consistent voltage delivery and efficient thermal management during extended use.Its construction supports in environments, providing stable power generation for engine and vehicle electrical systems.The unit's compact design allows for straightforward installation in tight engine compartments, matching dimensions and mounting configurations.It meets industry standards for performance and fitment, integration with existing wiring and drive systems.This alternator is suitable for vehicles where robust electrical output is required under continuous load conditions, supporting critical functions without interruption.