BULB 6 VOLT 21/5 W BAY15D
Bulb 6 volt 21/5W BAY15D
Dual filament for tail light and brake light
Dual filament bulb (21W/5W) for 6 volt electrical systems. The BAY15D fitting features an offset bayonet connection with two contacts for combined tail light and brake light. Suitable for rear lighting on military jeeps.
|
Voltage 6 volt |
Wattage 21/5 watt (dual filament) |
|
Base BAY15D (15mm offset bayonet) |
Application Tail light and brake light |
Features
- Dual filament: 21W (brake light) and 5W (tail light)
- BAY15D base with offset pins (180° spacing)
- 15mm diameter bayonet fitting with two contacts
- Replacement number: 1154 (6V) / equivalent to 1157 (12V)
- Suitable for combined tail/stop light functions
★ Traditional bulb with dual filament construction for reliable tail light and brake light function in 6 volt systems.
Installation notes
The offset pins ensure the bulb can only be fitted one way. Check before installation that the electrical system is 6 volt — for 12 volt conversions the 1157 bulb is required.
Compatibility
Only suitable for 6 volt systems. When converting to 12 volt you must switch to a 1157 bulb (same BAY15D fitting, 12V specification). The two contacts on the base operate the tail light (5W) and brake light (21W) respectively.
Historical context
The BAY15D fitting became the standard during WWII for military vehicles with combined tail/brake light function. The dual filament design made it possible to provide both running lights and brake light signalling with a single bulb.
This description was generated automatically. Unsure about fitment? Contact us at info@willys.be.
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This part is intended for the restoration of historic military vehicles. Fitting, aligning, deburring or reworking is part of that work and is inherent to the nature of these goods. Dimensional variation also exists between original vehicles.
Installation requires technical knowledge of the vehicle. Unsure whether this part suits your version? Ask us before purchase at info@willys.be.
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |