Seachoice Anode Kit – Mercruiser Alpha One Gen I (1984–1990), Magnesium | Freshwater
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Seachoice Anode Kit – Mercruiser Alpha One Gen I (1984–1990), Magnesium | Freshwater
This complete magnesium anode kit is designed specifically for Mercruiser MR and Alpha One Gen I stern drives from 1984 to 1990, used in freshwater environments. It provides full corrosion protection for the drive, replacing all sacrificial anodes in one convenient kit.
All components are cadmium-free and conform to Mil-Spec A-21412(SH). Magnesium anodes are the correct choice for freshwater use — they are more electrochemically active than aluminum or zinc in low-conductivity freshwater, providing effective galvanic protection where other anode materials may be too passive to work properly.
Kit Contents
- 1 block anode for the gimbal housing
- 1 skeg anode for the ventilation plate
- 2 nut anodes for the stern drive
- 18 stainless steel 8/304 screws for installation
Key Features
- Magnesium construction — correct material for freshwater use
- Cadmium-free and environmentally responsible formulation
- Conforms to Mil-Spec A-21412(SH) military-grade corrosion protection standard
- Complete kit covers all anode positions on the Alpha One Gen I drive
- Includes all mounting hardware for a straightforward installation
Compatible Applications
- Mercruiser MR stern drives (1984–1990) — freshwater use
- Mercruiser Alpha One Gen I stern drives (1984–1990) — freshwater use
- Lakes, rivers, and other freshwater environments
Parts Desk Insights
This kit is the right choice for owners of 1984–1990 Mercruiser MR and Alpha One Gen I drives who operate exclusively in freshwater and want to replace all drive anodes in a single purchase. Magnesium is the correct anode material for freshwater — it is significantly more active than aluminum or zinc in low-conductivity water, where those materials may not corrode fast enough to provide effective galvanic protection for the drive. Using aluminum or zinc anodes in freshwater is a common mistake that can leave the drive underprotected. If you operate in saltwater or brackish water, use the aluminum version instead: Seachoice Anode Kit – Mercruiser Alpha One Gen I (1984–1990), Aluminum. For 1991 and newer Alpha One Gen II drives, see the Seachoice Anode Kit – Mercruiser Alpha One Gen II, Aluminum and Seachoice Anode Kit – Mercruiser Alpha One Gen II, Magnesium. For an OEM-spec alternative, see the MerCruiser Alpha One Gen II Magnesium Anode Kit.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.