ARCO SW950 12V Starter Solenoid for Yamaha
ARCO SW950 12V Starter Solenoid for Yamaha — Product description
The ARCO Marine SW950 is a 12-volt starter solenoid built as an OE replacement for Yamaha engines. Four terminals, marine-grade construction, and the kind of dependable switching ARCO's been known for across nearly 60 years. When your starter clicks but won't crank, this is the part that gets you turning over again.
A starter solenoid doesn't get much attention until the day it quits. You turn the key, hear a click, and nothing happens. That's usually the solenoid, and the ARCO Marine SW950 is the part that puts you back in business.
This is a 12-volt, 4-terminal solenoid built as an OE replacement for Yamaha engines. It's the high-current switch that sits between your battery and your starter motor. Turn the key, a small signal energizes the coil, and the solenoid closes a heavy contact that dumps full battery current into the starter. No solenoid, no crank. It's a simple job, but it has to work every single time, in salt air, heat, and vibration.
ARCO has been making marine engine parts for nearly 60 years. Alternators, inboard and outboard starters, tilt and trim motors, and the solenoids that go with them. Every unit gets tested beyond normal operating conditions before it ships, which is why so many mechanics reach for ARCO when an original part fails. The SW950 meets or beats the original spec, so you're not trading reliability for a lower price.
Installation is straightforward if you've wired a solenoid before. Match the four terminals to your old unit, transfer the heavy battery and starter cables to the large studs, and land the two small trigger wires on the smaller terminals. Kill the battery first. Take a photo of the old wiring before you pull anything, and you'll thank yourself later. If your old solenoid carries the SW950 designation or you've confirmed the terminal layout matches, this one drops right in.
Who's this for? Anyone running a Yamaha rig who's chasing a no-crank, a slow crank, or a solenoid that only fires when it feels like it. Keep one in the spare parts box too. A solenoid is cheap insurance against a dead-in-the-water morning at the ramp. It isn't a fit for engines outside the Yamaha application, so confirm the part number or terminal pattern against your motor before you order.
Key Features
- 12-volt operation matches the marine electrical system on your Yamaha rig
- Four-terminal design replaces the original solenoid layout
- OE replacement fit for Yamaha engines, meets or beats factory spec
- High-current contacts switch full battery power straight to the starter motor
- Tested beyond normal operating conditions before it leaves ARCO
- Built by ARCO, nearly 60 years of marine engine parts experience
Why Buy from NVN Marine
- Authorized ARCO Marine reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | ARCO Marine SW950 Starter Solenoid |
|---|---|
| Brand | ARCO Marine |
| Manufacturer Part Number | SW950 |
| UPC | 693006009346 |
| Voltage | 12 Volt |
| Number of Terminals | 4 |
| Product Type | Starter Solenoid |
| Replacement Type | OE Replacement |
| Engine Compatibility | Yamaha |
Frequently asked questions
What is the ARCO SW950?
It's a 12-volt, 4-terminal marine starter solenoid built as an OE replacement for Yamaha engines. It's the heavy-duty switch that sends battery current to your starter when you turn the key.
How many terminals does it have?
Four. Two large studs carry the heavy battery and starter cables, and the two smaller terminals take the trigger wiring.
What voltage is it?
12 volts, matching a standard marine 12-volt starting system.
Will it fit my Yamaha?
The SW950 is designed as an OE replacement for Yamaha engines. Confirm the part number or match the four-terminal layout against your existing solenoid before ordering, since applications vary by model.
Is this an original-equipment part?
It's an ARCO OE replacement. ARCO builds to meet or exceed the original spec and tests every unit beyond normal operating conditions, so it performs like the factory part.
What does a starter solenoid actually do?
When you turn the key, a small signal energizes the coil and closes a heavy contact. That contact dumps full battery current into the starter motor so it can crank the engine. If the solenoid fails, you'll usually get a click and no crank.
