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SKU:
ZZ3F09046
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8M0052939 Neutral Switch Shift Fit Mercury Mercruiser 100HP 115HP 135HP 150HP
$101.19
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$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 MerCruiser 100HP 115HP 135HP 150HP
The 8M0052939 neutral switch shift is a marine-grade safety component for Mercury MerCruiser outboard and sterndrive engines, ensuring the motor cannot start unless the shift is in neutral. This neutral safety switch is built for 100HP, 115HP, 135HP, and 150HP models, delivering dependable shift interlock performance in saltwater or freshwater conditions. Its design mirrors the original OEM configuration for straightforward replacement of worn or failed units.
Overview
This neutral switch shift is a safety interlock switch that prevents accidental engine start-up while the drive is engaged, protecting both operator and drivetrain. It is crafted for use with Mercury MerCruiser engines in the 100HP to 150HP range, ensuring reliable operation every time the ignition is turned. The neutral switch shift restores proper start-only-in-neutral functionality to your marine power system.
Built For Performance
- Direct replacement part number 8M0052939 for MerCruiser applications
- High-quality switch contacts for accurate neutral detection
- Marine-grade materials resist corrosion from saltwater exposure
- Precision-fit mounting points for easy installation on compatible engines
- Sealed electrical design prevents moisture ingress and short circuits
- Tested for mechanical durability across repeated shift cycles
Fits These Machines
- for Mercury MerCruiser 100HP engines
- for Mercury MerCruiser 115HP engines
- for Mercury MerCruiser 135HP engines
- for Mercury MerCruiser 150HP engines
On-The-Job Use
- Mounts in the shift cable or control mechanism to sense gear position
- Enables safe engine cranking only when the throttle lever is in neutral
- Frequently replaced during routine maintenance or after shift linkage adjustments
- Essential for preventing accidental forward or reverse starts at the dock or launch ramp
Specs At A Glance
| Part Number(s) | 8M0052939 |
| Type | Neutral Safety Switch |
| Voltage | 12V DC |
| Compatible Brands | Mercury, MerCruiser |
| Horsepower Range | 100–150 HP |
Good To Know
Q: Will this switch fit my 115HP MerCruiser engine? A: This neutral switch shift is specified for 100HP, 115HP, 135HP, and 150HP MerCruiser models, but confirm your engine serial number to ensure proper fitment.
Q: What happens if the neutral safety switch fails? A: A faulty switch can prevent the engine from starting at all or allow it to start in gear, which is dangerous. Replacing it with this 8M0052939 part restores safe and reliable start-up.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.