Diesel Alternator, Westerbeke, 12 Volt, 40 Amp, 20122


Diesel Alternator, Westerbeke, 12 Volt, 40 Amp, 20122
SKU: 115558
Mfg# 20122
UNIT: Each
Description: AlternatorRated Output: 40 ampVoltage: 12 volt
Typically Ships Out in 1-2 Business Days


Alternator, Diesel Only, Westerbeke, 12 volt, 40 amp, 20122.

  • This API alternator replaces Part No.: 32939 and 37088
  • This is a 40 amp 3 Wire Alternator

For Diesel Engine Applications Only, NOT ignition protected, NOT SAE J1171 compliant, NOT for gasoline engine use.
(SAE J1171 compliance specifically deals with external ignition protection of marine electrical devices in gasoline powered marine engines.)



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Sterndrive Engineering offers a one (1) year fault free warranty on rotating electrical parts (Starters, Alternators, Trim Motors) and a one (1) year Limited warranty on all other parts (solenoids, voltage regulators, water pumps, etc.). These warranties do not apply to any repairs, alterations, or work undertaken by third parties not involved in the actual manufacturing of the product.


  • Restocking charge will apply at a minimum of 10% for all product returned.
  • All Returns must be returned within 30 days of receipt of the items.
  • Some products are non-returnable, please contact us for further details.
  • Manufacturer defects reported within 30 days of receipt will be supplied a pre-paid label for return shipping upon approval.
  • Please contact Go2marine for Manufacture Defects, Returns and help with Warranties.