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Prop 65 Cancer and Reproductive Harm WarningUsually ready in 2 hours
2045 West Buckeye Road
Phoenix AZ 85009
United States
The Whelen BU82107 is a self-adjusting back-up alarm for commercial vehicles and mobile equipment. It monitors surrounding noise and automatically adjusts its warning output from 82 to 107 dB, helping maintain an effective reverse warning without producing more sound than operating conditions require.
Designed for 12–48 VDC electrical systems, the BU82107 uses stud connections and a fully encapsulated, glass-filled nylon housing for resistance to moisture, vibration, and corrosion. It is suitable for water trucks, construction equipment, dump trucks, utility vehicles, and other light- and heavy-duty vehicle applications.
Whelen rates the BU82107 to SAE Class F and states that it reassesses ambient noise approximately every half second. Confirm system voltage, mounting location, wiring method, and applicable warning-alarm requirements before installation.
| Feature | Details |
|---|---|
| Self-Adjusting Output | Automatically responds to changing ambient noise |
| Warning Range | 82–107 dB |
| Wide Voltage Compatibility | Operates on 12–48 VDC electrical systems |
| Stud Connection | Stud-style positive and negative electrical connections |
| Encapsulated Housing | Resists moisture, vibration, and corrosion |
| Universal Mount | Designed for installation across compatible commercial vehicles and equipment |
| Attribute | Details |
|---|---|
| Brand | Whelen |
| Model | BU82107 |
| UnitedBuilt SKU | 0002986 |
| Product Type | Self-Adjusting Back-Up Alarm |
| Sound Output | 82–107 dB |
| Voltage | 12–48 VDC |
| Ambient Adjustment | Approximately every 0.5 second |
| Electrical Connection | Stud |
| Housing | Glass-Filled Nylon |
| Encapsulation | Fully Encapsulated |
| Certification | SAE Class F |
| Dimensions | 5.20 in. W × 3.20 in. H × 2.88 in. D |
| Warranty | 2 Years |
| Application | Typical Use |
|---|---|
| Water Trucks | Audible reverse warning for compatible truck electrical systems |
| Construction Equipment | Warning alarm for equipment operating around changing noise levels |
| Dump and Vocational Trucks | Self-adjusting reverse warning for heavy-duty applications |
| Service and Utility Vehicles | Reverse-warning installations requiring 12–48 VDC compatibility |
| Check | Guidance |
|---|---|
| Electrical System | Confirm the vehicle supplies 12–48 VDC |
| Wiring | Use wiring of at least 16 AWG and verify connection polarity |
| Mounting Position | Follow the Whelen installation guide, which directs vertical mounting facing the rear |
| Mounting Location | Keep the alarm away from excessive heat, enclosed spaces, and impact exposure |
| Warning Level | Confirm the alarm remains louder than surrounding noise and complies with applicable regulations |
| Inspection and Testing | Test the alarm daily and document the results in the vehicle maintenance record |
| Weight | 0.74 lb |
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