ARCO 12V 70A MerCruiser 3.0L Marine Alternator

The ARCO 20810 alternator is designed as a replacement for compatible 1999-up MerCruiser 3.0L engines. It uses an internal fan and comes with a single-groove pulley, matching the configuration specified for this application. Supplying the pulley with the unit reduces the need to transfer a worn or damaged pulley from the old alternator. The compact engine-specific fit makes this a straightforward service replacement when the existing charging system remains in its original layout.

ARCO identifies Delco 19020600 and 19020604 as replacement references and also lists Mercury 862030T and 862030T01. Sierra 18-5983, Protorque PH300-0033 and PH300-0034, MPParts ADR0317 and ADR0299, and Quicksilver 862030T01 are included in the cross-reference information. ARCO says its alternators are manufactured for reliability and verified against OEM performance standards before shipment. Those references should be compared with the removed unit when engine history or prior repairs are uncertain.

Inspect the belt, pulley alignment, electrical terminals, and mounting hardware while the charging system is apart. A fully charged battery and low-resistance connections make post-installation testing more meaningful and reduce stress on the replacement unit. ARCO provides 12 months of materials-and-workmanship coverage for leisure use and 90 days for commercial or racing use when the product is properly installed. Registration within 30 days can extend coverage for eligible rotating-electric products.

• Single-groove pulley included
• Internal-fan construction for the specified application
• Cross-references Delco, Mercury, Sierra, Protorque, MPParts, and Quicksilver numbers
• Factory checked against OEM performance requirements

For additional MerCruiser alternators and marine charging-system replacements, Browse more Marine Alternators for related replacement and service components.