31700-ZV1-003 Rectifier Assembly - Overview. The 31700-ZV1-003 Rectifier Assembly is a critical component in Honda marine engine electrical systems. This part is responsible for converting the alternating current (AC) generated by the engine's alternator into direct current (DC) to charge the battery and power the boat's electrical systems reliably. Engineered to precise factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability..