31750-ZZ3-003 Regulator Rectifier - Overview. The 31750-ZZ3-003 Regulator Rectifier is an essential OEM component in Honda marine engine electrical systems. It plays a critical role in regulating the alternator's output voltage and converting AC current into DC current, supporting the engine's charging system and electrical functions. Designed to OEM specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Regulates alter