37721-99E12 Suzuki 5033257 Johnson Neutral Switch | Genuine Used Part

🔧 Product Description

Genuine Suzuki Johnson Gear-Position and Neutral Safety Switch - Part Number: 37721-99E12

A genuine used Suzuki gear-position switch also supplied on selected Suzuki-built Johnson four-stroke outboards under Johnson part number 5033257.

The switch detects when the remote-control and shift mechanism is in neutral. Its signal is used by the starting-safety and engine-management systems to prevent cranking or inappropriate engine operation while a gear is engaged.

⚙️ Key Features

• Genuine used Suzuki / Johnson neutral switch
• Current Suzuki part number 37721-99E12
• Johnson cross-reference 5033257
• Supersedes earlier Suzuki switch revisions
• Used with the engine shift-linkage assembly

🚤 Compatibility

Commonly used on

• Suzuki inline four-cylinder four-stroke shift-linkage assemblies
• Suzuki-built Johnson four-stroke outboards

Typically suits

• Engine models:
• Suzuki DF40
• Suzuki DF50
• Suzuki DF60
• Suzuki DF70
• Suzuki DF90
• Suzuki DF100
• Suzuki DF115
• Suzuki DF140
• Johnson 90HP four-stroke
• Johnson 115HP four-stroke
• Johnson 140HP four-stroke
• Production groups whose shift-control diagram specifies 37721-99E12 or 5033257
• HP Range: Approximately 40HP - 140HP
• Engine Type: Suzuki-built EFI four-stroke outboard
• Year Range: Primarily early-to-mid 2000s, dependent on model and serial number

🔌 Function

The switch confirms neutral gear position to the starter-interlock and engine-control circuits.

⚠️ Common Signs of Failure

• Starter does not operate while the control is in neutral
• Engine cranks while a gear is engaged
• Neutral position is recognised intermittently
• Engine idle strategy changes unexpectedly
• Switch plunger or actuator is worn
• Connector terminals are corroded
• Switch fails continuity testing as the shift linkage moves

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 37721-99E12 → Supersedes 37721-99E11
• 37721-99E11 → Supersedes 37721-99E10
• 37721-99E10 earlier neutral-switch reference

OEM / Related Numbers

• 37721-99E12
• 3772199E12
• 37721-99E11
• 37721-99E10
• 5033257
• 05033257
• Related shift-linkage cam, bracket and wiring connector

Aftermarket / Verified Equivalents

• Aftermarket direct-replacement neutral switches sold under 37721-99E12
• Aftermarket direct-replacement neutral switches sold under 5033257

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated