ARCO 12V 50A Mercury Outboard Marine Alternator

The ARCO 20850 alternator is made for compatible Mercury outboards using the 1.5L and 3.0L engine platforms. A multi-groove serpentine pulley and an internal fan are included as part of the assembly. The unit also comes with the wire and plug connector identified by ARCO, which can simplify replacement when the original connector arrangement matches. This is a model-specific outboard charging replacement rather than a universal alternator.

ARCO lists an extensive interchange range for this alternator, including Delco 8600514, 19020704, and 19020707 and Mercury 8M0064020, 8M6000803, 828506, 875286A-1, 881247A1, and 889956. Sierra 18-6455 is also listed, along with several Protorque and MPParts references. ARCO says every alternator is engineered and manufactured for reliable performance and must meet or exceed the applicable OEM performance level before packaging. The broad cross-reference list is useful for verifying a removed unit that may have been replaced previously with an aftermarket part.

Before installation, compare the pulley grooves, plug style, mounting points, and wire routing with the alternator being removed. Keep the charging connections clean and secure so voltage drop in the wiring does not interfere with system performance. The manufacturer lists 12 months of warranty coverage for defects in leisure use and 90 days for commercial or racing use. This rotating-electric product may qualify for an extra warranty year when registered within the stated 30-day period.

• Includes a multi-groove serpentine pulley
• Supplied with the specified wire and plug connector
• Broad OEM and aftermarket cross-reference coverage
• Designed specifically around Mercury outboard charging applications

For more outboard charging replacements and compatible marine electrical hardware, Browse more Marine Alternators for related replacement and service components.