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SKU:
ZZ3F09045
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8M0052939 Neutral Switch Shift Fit Mercury 350HP, 350 377 496 5.0L MAG 814281A7
$101.19
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$101.19
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
8M0052939 Neutral Switch Shift for Mercury 350HP, 350 377 496 5.0L MAG
The 8M0052939 neutral switch shift is a direct replacement component for Mercury and MerCruiser engines, engineered to accurately detect gear position and prevent starter engagement while in gear. This neutral safety switch fits 350HP, 350, 377, 496, and 5.0L MAG models, providing reliable shift interlock function for marine propulsion systems. It is designed to match the original OEM cross-reference number 814281A7, ensuring compatibility with the specified powerplants.
Overview
This neutral switch shift is a critical safety and control component that ensures the engine starts only when the transmission is in neutral. It enables smooth and dependable shift operation for Mercury and MerCruiser marine engines, specifically tailored for 350HP, 350, 377, 496, and 5.0L MAG configurations. The neutral switch shift serves as a direct replacement for the original part, restoring factory-grade shift interlock performance.
Built For Performance
- Direct replacement for OEM part numbers 8M0052939 and 814281A7
- Precision electrical contacts ensure consistent gear position detection
- Corrosion-resistant housing for extended marine environment service life
- Factory-matched connector geometry for plug-and-play installation
- Sealed construction to guard against moisture and vibration damage
- Compatible with standard 12-volt marine electrical systems
Fits These Machines
- for Mercury 350HP engines
- for Mercury 350 MAG engines
- for Mercury 377 MAG engines
- for Mercury 496 MAG engines
- for Mercury 5.0L MAG engines
On-The-Job Use
- Installs in the shift linkage or transmission housing to monitor gear position
- Prevents starter motor engagement when drive is in forward or reverse
- Used during routine engine start-up and docking maneuvers
- Replaces worn or faulty neutral safety switches on inboard and sterndrive setups
- Supports safe operation in both freshwater and saltwater boating environments
Specs At A Glance
| Part Number(s) | 8M0052939, 814281A7 |
| Type | Neutral Safety Switch |
| Voltage | 12V DC |
| Compatible Brands | Mercury, MerCruiser |
| Horsepower Range | 350–496 HP |
| Engine Displacement | 5.0L, 5.7L, 6.2L, 8.1L |
Good To Know
Q: Will this neutral switch work on my 5.0L MAG engine? A: Yes, the 8M0052939 is designed to fit Mercury 5.0L MAG engines and other listed models, but always verify your serial number for exact compatibility.
Q: How do I know if my neutral safety switch needs replacement? A: If the engine fails to start in neutral or starts in gear, the switch is likely faulty. Replace it with this unit to restore safe starting operation.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.