Return to previous page

Mercruiser Replacement Marine Grade Alternator  API-20051

Alternator is US Coastguard approved Marine Alternator (Delco 10SI 12V 78amp) with 12 month Manufacturers Warranty 

  • Suitable for many applications including Mercruiser, OMC and Volvo installations using a Delco 10SI Alternator.  
  • Replaces Merc #’s 56045, 59755, 69729, 78403A1, A2 I-Wire hook up Ignition protected SAEJ1171, Neg Ground – Sierra # 18-5950 and Arco# 20102
  • Alternator Manufactured by API – a Major US Marine Manufacturer of Aftermarket marine products.
  • Also Available Sterndrive Legs and accessories manufactured by SEI. Replacement for Mercruiser Alpha Installations.


Manufacturers Warranty 3 years on Sterndrives and 1 Year on Brand New Installation Kits, Drive Shafts, Seal Kits, and spare parts Available for all Outboard Lower Units.
Stock Available in Australia – Orders Processed within 5 Business Days from payment.
Tax Receipts and detailed Manufacturers Warranty information Provided.
Local pick-up or Courier at Customers Cost. Please contact seller for Freight Cost.

For More Information on Applications and Gear Ratios call

Call 0414 777 858


Blackstar Marine is a Registered Melbourne & Adelaide Dealer in Australia.
We have over 30 Years Experience in high performance engines, gearboxes, and marine fittings.

Weight 6 kg
Dimensions 20 × 20 × 17 cm
CALL US NOW