ARCO Zeus A275L Single Foot Alternator with Regulator

The ARCO Zeus A275L Single Foot Alternator is a high-output 12V unit with an external rectifier, dual cooling fans and heat-shedding finish.

Single foot is the mounting configuration, and it has to match the engine bracket exactly. The Vortec version of the same alternator uses a different mounting, so the engine determines which one fits rather than any performance consideration. Ordering the wrong foot means an alternator that cannot be bolted on.

Thermal management is the substance of the design: E-Coat or Cerakote finishes, an externally mounted rectifier and dual cooling fans. ARCO claims 8 to 20 percent cooler running than comparable units. Heat is what limits sustained alternator output, so a cooler alternator delivers its rating rather than derating itself after twenty minutes.

Moving the rectifier outside the case is the significant change, since diodes are the most heat-sensitive part. High output on 12V suits large battery banks and heavy electrical demand in marine, RV, military and commercial use. Explore more marine alternators.

• Single foot mounting: the engine decides, not preference
• The Vortec version mounts differently
• 8-20% cooler running than comparable units
• External rectifier moves the diodes out of the heat