S25R BAY15D PR21/5W 47387 12V 21/5W Red Halogen Light Bulbs – Staggered Pin Double Contact OEM Fit
S25R BAY15D PR21/5W 47387 12V 21/5W Red Halogen Light Bulbs – Staggered Pin Double Contact OEM Fit
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Restore vivid, road-compliant red braking and tail illumination behind clear or smoked lenses with our Super Bright S25R BAY15D (PR21/5W / Part #47387) Dual-Filament Halogen Bulb (Red). Designed specifically for 12V vehicles equipped with clear, frosted, or aftermarket tail light housings, this classic bayonet bulb features a full-size S25 globe, two bottom contact points, and two staggered-height locking lugs situated 180 degrees apart. Built with an intense 21W filament for immediate brake and stop signaling and a steady 5W filament for continuous night tail/marker lights, it produces an authentic deep red beam without dashboard error warnings or hyper-flashing issues.
Key Features & Benefits
- Engineered for Clear & Smoked Lenses: High-temperature baked optical red coating produces an intense, deep red light output, ensuring legal compliance and rich coloration when installed behind transparent or tinted light lenses.
- Dual-Filament Versatility (21W / 5W): Combines a high-output 21W filament for instant brake and stop light recognition with an energy-efficient 5W filament for continuous night tail and marker lamp operation.
- Precision BAY15D (Staggered Pin) Base: Manufactured to exact OEM dimensional standards with two bottom solder terminals and side retention lugs placed at staggered (different) heights across 180°, ensuring correct keying and preventing reverse insertion into factory sockets.
- Zero Dash Errors & Factory CANBus Safe: Draws authentic factory resistive wattage (21W / 5W), functioning seamlessly with standard vehicle body control modules (BCM) and onboard bulb detection systems without load resistors or wire splicing.
- Fade-Resistant Red Coating: High-grade optical red coating resists flaking, blistering, or heat discoloration under prolonged braking cycles, maintaining rich red color consistency over its full lifespan.
- Reinforced Heavy-Duty Construction: Supported internal filament mounts resist rough road vibrations, chassis movement, and tailgate slamming for long-term service life.
- 100% Plug & Play: Direct 1:1 twist-and-lock bayonet replacement—swaps out your burned-out factory red brake/tail bulbs in seconds.
Technical Specifications
| Bulb Model / Socket | S25R (Base: BAY15D / Globe: S25) |
| Part Reference Numbers | 47387 / PR21/5W / 1157R / 7528R / 380R |
| Base Pin Configuration | 2 Staggered Lugs (180° apart, offset vertical heights) |
| Bottom Contact Points | Double Contact (Two Solder Terminals) |
| Lighting Technology | Halogen / Incandescent Miniature Bulb (Dual Filament) |
| Operating Voltage | 12V DC (Passenger Vehicles Only) |
| Actual Output Power | 21W (Major / Stop Filament) / 5W (Minor / Tail Filament) |
| Emitted Color | Red (Brake / Stop / Tail) |
| Lens / Glass Finish | High-Temperature Optical Red Coated Glass |
| Primary Applications | Stop Light, Brake Light, Tail Light, Rear Fog Light (Behind clear/smoked lenses) |
| Installation Type | Push-and-Twist Bayonet OEM Replacement (Plug & Play) |
Important Installation & Pin Configuration Check
- 12V Electrical Systems Only: Exclusively engineered for 12V cars, SUVs, vans, and light utility vehicles. Not compatible with 24V commercial haulers.
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Check Pin Height & Contact Layout Before Ordering:
- BAY15D / PR21/5W (This Bulb): Double bottom contacts with staggered/stepped pin heights at 180 degrees directly opposite.
- BA15D (47381): Double bottom contacts with pins level at the same height.
- BAZ15D (47386): Double bottom contacts with offset angle (150°) and staggered heights.
- Installation Tip: Clean the socket terminals of any dust or oxidation before seating. Push gently into the socket and rotate clockwise until the staggered lugs lock firmly in their tracks.