Brand new Ignition Protected SAEJ1171 12V 50 Amp Alternator for the Mercury Racing 2.5 Liter EFI 280 HP Race Offshore Shore (ROS) and Consumer Outboards. 
 
This is a direct replacement for another NLA (no longer available from Mercury Marine or Quicksilver) part and includes a new multi-groove serpentine pulley. 
 
We carry both the early and later style to fit all 280s produced; serial numbers 0G857000 through 0T999519 are stamped on your mid-section.
 
Part Numbers:
857006A3, 857006T I, 834832 T, 85700
 
Contact Mike Hill at STVracer@yahoo.com with any questions.