ARCO Starter Solenoid – MerCruiser, Cobra & Volvo Penta (SW450)
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You have 30 days to request a return. All sale items are final sale.
ARCO Starter Solenoid – MerCruiser, Cobra & Volvo Penta
Purpose-built for MerCruiser, Cobra, and Volvo Penta applications, this 4-terminal 12-volt starter solenoid is the correct replacement for engines paired with ARCO 30460 and 30470 series starters. The 4-terminal configuration handles both the main starter circuit and the accessory trigger circuit, making it the right fit where a standard 2- or 3-terminal solenoid won't do. Built to marine-grade standards, it resists corrosion and vibration for long-term reliability in saltwater and freshwater environments alike.
Compatible Applications
- MerCruiser sterndrive engines requiring a 4-terminal 12V starter solenoid
- Cobra sterndrive engines requiring a 4-terminal 12V starter solenoid
- Volvo Penta engines requiring a 4-terminal 12V starter solenoid
- Fits engines equipped with ARCO 30470A starter and ARCO 30460 series starters
Specifications
- Voltage: 12V
- Terminals: 4
- Part Number: SW450 (57-SW450)
Parts Desk Insights
The SW450 is the go-to solenoid when you're replacing or rebuilding a starter system on a MerCruiser, Cobra, or Volvo Penta engine that uses an ARCO 30460 or 30470A starter. The 4-terminal design is a key detail — if your original solenoid has only 2 or 3 terminals, this is not the right part. For single-engine OMC applications or lighter-duty setups, see the ARCO OMC Solenoid – 12V Grounded Base (57-SW268). For the highest-output option across MerCruiser, OMC, and Volvo Penta platforms, consider the ARCO Heavy-Duty Starter Solenoid (SW463).
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.