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ARCO Marine Premium Replacement Outboard Alternator w/Multi-Groove Pulley - 12V 50A [20850]

Save $103.05 Save $103.05
Original price $470.00
Original price $470.00 - Original price $470.00
Original price $470.00
Current price $366.95
$366.95 - $366.95
Current price $366.95

Premium Replacement Outboard Alternator with Multi-Groove Pulley - 12V 50A

Replacement alternator that will fit 1.5L & 3.0L Mercury Outboard, 12 Volt, 50 AMP, Internal Fan, Multi-groove serpentine pulley included, Includes wire/plug connector.


  • All alternators are engineered for performance and reliability
  • All alternators are engineered and manufactured with precision and quality
  • All alternators must meet or exceed OEM performance before being boxed

Warranty Information:

When properly installed, all ARCO products are warrantied against defects in materials and workmanship for a period of 12 months for leisure use and 90 days for commercial or racing applications. 

Add an extra year of warranty to your rotating electric ARCO product (Tilt/Trim Motors, Alternators, Outboard Starters, and Inboard Starters) when you register your product within 30 days of purchase. You can register your product by visiting 


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SIERRA Alternator 18-6455
PROTORQUE Alternator PH300-0031
PROTORQUE Alternator PH200-T010
PROTORQUE Alternator PH200-T015
PROTORQUE Alternator PH200-T016
MPPARTS Alternator TRM0009
MPPARTS Alternator TRM0066

This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.


  • Amperage: 50A
  • Voltage: 12V
  • Box Dimensions: 8"H x 8"W x 9"L WT: 7.3 lbs
  • UPC: 693006008219

Quick Guide (pdf)