Whelen BU82107 82–107 dB Self-Adjusting Back-Up Alarm — UnitedBuilt Equipment Skip to content
Quality Water Truck Systems, Tanks & Parts Since 1947
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Back-Up Alarm, Self-Adjusting 82-107dB, 12-48 VDC, Universal Mount, Stud, Whelen BU82107 - UnitedBuilt Equipment

Back-Up Alarm, Self-Adjusting 82–107 dB, 12–48 VDC, Universal Mount, Stud Connection, Whelen BU82107

SKU 0002986
Brand Whelen
Availability:
10 in stock | Available on backorder
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$155.00
$155.00 - $155.00
$155.00
$115.20
$115.20 - $115.20
$115.20
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Product Images

Images are for representation only and may differ from the actual product.

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.

Key Features

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

Specifications

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

Applications

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

Selection and Installation Checks

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