Ignitions and Electrical› Charging Systems
ARCO MARINE
MERCRUISER 3.0L 99C ALTERNATOR
SKU: A09I 20810
Beginner — under 30 min
Description
It directly replaces several part numbers from Delco, Mercury, Sierra, Protorque, Mpparts, and Quicksilver.
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | ARCO MARINE |
| Part Number | A09I 20810 |
Videos
ARCO Zeus, the Fastest and Safest Way to Charge Your Batteries and Optimize Your Alternator
Lithium got Upgraded. Not clickbait! Does Arco Zeus replace a generator??
What is the Best Alternator for my Boat?
Ski Boat Alternator Upgrade
Install of ElectroMaax Marine Alternator on Yanmar Engine
Uprate your boats alternator
How To: Marine Electrical Seminar - Alternators - Ep 05/30
How to replace an inboard alternator | My Boat DIY
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return Policy