ARCO Mercury / MerCruiser Starter Solenoid – 12V Isolated Base (57-SW275)
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You have 30 days to request a return. All sale items are final sale.
ARCO Mercury / MerCruiser Starter Solenoid – 12V Isolated Base
Restore reliable starting to your Mercury or MerCruiser engine with this direct-fit 12-volt starter solenoid. The isolated-base design provides clean electrical isolation from the engine block, making it the correct choice for Mercury and MerCruiser applications that require a floating ground. Built to withstand the corrosion, vibration, and moisture exposure of the marine environment, this solenoid installs without modification and gets your starting system back to full operation.
Compatible Applications
- Mercury outboard engines requiring a 12V isolated-base starter solenoid
- MerCruiser sterndrive engines requiring a 12V isolated-base starter solenoid
Specifications
- Voltage: 12V
- Base Type: Isolated
- Part Number: 57-SW275
Parts Desk Insights
This is the right solenoid when your Mercury or MerCruiser application specifically calls for an isolated-base unit — a common requirement on many Mercury outboards and MerCruiser sterndrives where the solenoid must not share a ground path with the engine block. If you're unsure whether your engine needs an isolated or grounded base, check your wiring diagram before ordering. For OMC applications, see the ARCO OMC Solenoid – 12V Grounded Base (57-SW268). For higher-demand or multi-engine setups, consider the ARCO Heavy-Duty Starter Solenoid – MerCruiser, OMC, Volvo Penta (SW463). Also available: ARCO 12V Starter Solenoid for Mercury & MerCruiser (SW109).
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.