Federal Military Parts (763) 310-9340
Reverse Light Switch (Neutral Safety Switch), for Military HUMVEE, 5714586 5930-01-461-9037
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15.400 DJF
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Upgrade Your HMMWV for the Street: True OEM Military Neutral Safety / Reverse Switch
Tired of trying to explain to the DMV why your surplus Humvee doesn't have reverse lights? Want to stop guessing if your shifter is aligned right just to get the engine to turn over? It’s time to ditch the guessing games and upgrade your truck with the ultimate safety and compliance solution.
This is the Genuine OEM Military-Grade Neutral Safety & Reverse Light Switch—the exact heavy-duty component used on factory military ambulances and high-spec variants, engineered to survive the most punishing environments on Earth.
Why Your Humvee Needs This Switch:
- The Key to Street Legality: Frontline trucks left the factory with no backup lights. If you are building a custom backup light kit to pass state DMV inspection, this switch is the missing link. It bolts right into your existing shifter assembly to activate your rear lighting the moment you drop it into reverse.
- Rock-Solid Safety Interlock: Eliminates dangerous starting issues. This switch acts as a secure safety gate, guaranteeing your truck will only crank when safely in Park or Neutral.
- Fix the "Shifter Wiggle": Is your truck suffering from a "no-start" condition unless you aggressively slam or wiggle the gear selector? Your old switch contacts are likely worn or fouled by transmission fluid. Restore crisp, reliable ignition with a fresh swap.
- True Military-Grade Durability: Don't trust cheap commercial automotive switches to handle your rugged 24V system. This switch features fully sealed, heavy-duty wiring leads and robust weatherproof casing designed to handle mud, water, and hard vibration without missing a beat.
Whether you are piecing together a custom DIY LED backup light setup or replacing a leaking, sluggish factory unit, don't settle for flimsy aftermarket imitations. Give your HMMWV the authentic, heavy-duty reliability it deserves.
Reverse Light Switch for military HUMVEE. Often used as a neutral safety switch also.
The reverse light switch is much simpler. When the transmission is shifted into Reverse, the switch closes and sends power to the rear backup lights. A failed switch typically results in:
- No reverse lights.
- Reverse lights staying on constantly.
- Intermittent backup light operation.
What a Reverse Light / Neutral Safety Switch Does
This component acts as a dual-purpose electrical gatekeeper for a vehicle's transmission system. It uses fluid pressure or mechanical linkage from inside the transmission to control two vital vehicle functions:
- Activates the Reverse Lights: When the driver shifts into Reverse (R), the switch triggers and completes an electrical circuit. This sends power directly to the rear backup lights, signaling to anyone behind the vehicle that it is moving backward.
- Enables Safe Engine Starting: It also serves as a safety interlock. It ensures the engine can only crank and start when the transmission is safely in Park (P) or Neutral (N), preventing the vehicle from dangerously jumping forward or backward upon startup.
Signs You Need a New Switch
A person needs to replace this switch when it experiences internal electrical failure, worn-out contacts, or fluid leaks. Common symptoms include:
- No Backup Lights: The reverse lights completely fail to turn on when shifting into Reverse, even though the bulbs and fuses are perfectly fine.
- Reverse Lights Stay On Constant: The lights remain illuminated even when driving forward or parked, which can blind other drivers and drain the battery.
- A "No Crank, No Start" Condition: The engine refuses to crank or turn over when keying the ignition, because the broken switch fails to verify that the vehicle is safely in Park or Neutral.
- The "Wiggle" Trick is Required: The vehicle only starts if the gear shifter is forcefully jiggled or firmly pushed further into the Park position.
- Transmission Fluid Leaks: Because this switch is threaded directly into the transmission body, aged internal seals can degrade, causing transmission fluid to visibly weep or drip from the switch's electrical connector.
| Function | Military Part Number | NSN | Notes |
|---|---|---|---|
| Neutral Safety Switch | 12338435 | 5930-01-212-3373 | Common M998-series switch with large thread body. |
| Neutral Safety / Reverse Switch | 5714586 | 5930-01-461-9037 | Same switch style often used for either function. |
| Feature | Neutral Safety Switch (NSS) | Reverse Light Switch |
|---|---|---|
| Purpose | Prevents engine starting unless transmission is in Neutral (or Park on some civilian vehicles). | Turns on reverse lights when transmission is shifted into Reverse. |
| Location | Mounted on the transmission shift selector mechanism. | Mounted on the transmission shift selector mechanism, typically adjacent to the NSS. |
| Function | Completes the starter circuit only when transmission is in Neutral. | Completes the reverse light circuit only when transmission is in Reverse. |
| Symptoms of Failure | Engine won't crank in Neutral, intermittent starting issues, may require moving shifter to start. | Reverse lights stay off, stay on continuously, or operate intermittently. |
| Affects Starting? | Yes. | No. |
| Affects Backup Lights? | No. | Yes. |
