Description
The Sierra 18-6454 MERCURY Alternator is a premium marine-grade aftermarket alternator engineered specifically as a replacement for Mercury Marine and Mercury Sport Jet applications, particularly 2.5L outboard and high-performance engines. This component meets or exceeds stringent USCG, SAE J1171, and ISO 8846 safety standards to guarantee safe, ignition-protected operation in marine environments.
Technical Specifications
- Voltage: 12V
- Amperage: 50A
- Alternator Family: Delco 5SI
- Pulley Type: 4-Groove Serpentine Pulley
- Mounting Style: Spool Mount with a 9mm unthreaded mounting hole in a 58mm foot
- Internal Components: Heavy-duty bearings, an internal fan, an internal regulator, and an M6-1.0 B+ terminal stud
- Polarity: Negative ground
Cross-Reference & Compatibility
This part is a direct aftermarket replacement for several original equipment manufacturer (OEM) part numbers. It safely swaps with the following variants:
- Mercury Marine / Mariner: 875285T1, 857006T, 881248T, 881248T02, 889955, 889955A03, 889955T01, 8M0064021
- Delco: 19020703, 19020706
- Arco: 20840
- Prestolite: 20115010TBA
