Description
Sierra 18-6408 MerCruiser Marine Alternator – 105 Amp
Restore dependable charging performance to your boat with the Sierra 18-6408 MerCruiser Marine Alternator 105 Amp 12V. Designed for selected Mercury MerCruiser stern drive engine applications, this 12-volt, 105-amp replacement alternator replaces MerCruiser OEM part number 863077T.
Featuring an internal voltage regulator and a six-groove serpentine belt pulley, the Sierra 18-6408 provides a replacement solution for compatible MerCruiser marine engine charging systems. It is listed for a range of MerCruiser gasoline engines, including selected 4.3L, 5.0L, 5.7L, 6.2L, and 8.1L applications, as well as certain high-performance Scorpion and 496 Mag engines. Verify your engine's exact application before ordering.
Key Features
- Brand: Sierra Marine
- Part Number: 18-6408
- Product Type: Marine Replacement Alternator
- Voltage: 12 volts
- Output: 105 amps
- OEM Replacement: MerCruiser 863077T
- Voltage Regulator: Internal
- Pulley Type: Six-groove serpentine belt pulley
- Rotation: Clockwise
- Mounting Style: Saddle mount
- UPC: 808282378905
Compatible MerCruiser Marine Engines
The Sierra 18-6408 is listed for selected applications, including:
- MerCruiser 4.3L carbureted, MFI, and MPI engines
- MerCruiser 5.0L and 5.7L gasoline engines
- MerCruiser 6.2L MPI and Horizon engines
- MerCruiser 8.1L and 8.1S Horizon engines
- MerCruiser 496 Mag and 496 Mag HO engines
- Selected 377 Scorpion and Black Scorpion engines
Important: Compatibility varies by engine model, year, and configuration. Confirm your engine serial number and original alternator part number before purchasing.
Shop Sierra Marine Alternators
Keep your boat's electrical charging system operating properly with the right replacement marine alternator. Shop the Sierra 18-6408 MerCruiser Alternator at U.S. Boating & Marine Supplies. Verify fitment before ordering to ensure compatibility with your engine.
