ARCO 12V 55A MerCruiser Serpentine Alternator

The ARCO 60055 alternator replaces the charging unit used on compatible late-model MerCruiser engines. It uses an internal regulator and the specified marine mounting foot, matching the installation style identified by the supplier. A multi-groove serpentine pulley is supplied with the alternator so the belt-drive component does not have to be transferred from the old unit. The design is intended for a direct marine replacement where the original mounting and wiring configuration are retained.

ARCO states that its alternators are engineered and manufactured for dependable service and are checked against OEM performance requirements before packaging. Mercury 807652T is the principal OEM cross-reference provided for this unit. Sierra 18-5967 is also listed as an aftermarket interchange number. Using those numbers along with the mounting and pulley configuration gives the installer multiple ways to confirm that the replacement matches the removed alternator.

Check pulley alignment, belt condition, mounting hardware, and charging connections during installation rather than assuming the old installation was correct. Clean terminals and secure grounds are important because resistance in the charging circuit can reduce delivered output even when the alternator itself is functioning normally. ARCO lists 12 months of defect coverage for leisure applications and 90 days for commercial or racing use. Eligible rotating-electric products can receive an extra year when registered within 30 days of purchase.

• Internal regulator for the specified MerCruiser charging system
• Marine mounting geometry matched to the specified application
• Multi-groove serpentine pulley included
• Replaces Mercury 807652T and cross-references Sierra 18-5967

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