Description
The Sierra 18-5983 MERCRUISER Alternator is a marine-grade 12V, 70-amp internal regulator alternator engineered primarily for Mercruiser stern drive engines. It features a 7SI Delco-style frame, a heavy-duty hinge mount configuration, and a single groove V-belt pulley to provide reliable battery charging under demanding marine conditions.
Technical Specifications
- Voltage: 12V
- Amperage: 70A (7SI Series)
- Mount Type: Hinge mount
- Pulley Type: Single groove (V-belt style)
- Regulator: Internal
- Polarity: Negative ground
- Safety Standards: Certified to meet USCG, SAE J1171, and ISO 8846 marine ignition protection requirements for safety out of the box.
Compatibility & OEM Cross-Reference
This alternator is designed to fit several marine setups, most notably MCM 3.0L engines ranging from 1999 to current models. It serves as a direct aftermarket replacement for several original manufacturer part numbers, including:
- Mercury Marine / Mercruiser: 862030, 862030-1, and 862030T
- Arco: 20810
- Delco: 19020600 and 19020604
- API Marine: 20110
- Mallory: 9-19109
