Quick Facts

  • Manufacturer: Truck-Lite
  • Product Family: Super 44
  • Product Type: LED stop-turn-tail lamp
  • Lighting Category: Commercial truck and trailer rear lighting
  • Common Size: Four-inch round lamp
  • Primary Functions: Stop, turn-signal, and rear tail-light operation
  • Lighting Technology: Sealed LED
  • Common Voltage: 12 volts, with selected 24-volt configurations
  • Mounting Options: Grommet or flange mount, depending on part number
  • Common Connection: Truck-Lite Fit ’N Forget sealed connection, with configuration-specific plug or hardwired options
  • Primary Applications: Commercial trucks, tractors, trailers, buses, and vocational vehicles
  • Production Status: Current product family; individual configurations and availability vary

Overview

The Truck-Lite Super 44 LED Stop-Turn-Tail Lamp is a four-inch round rear-lighting product designed for commercial trucks and trailers. It combines the required stop, turn-signal, and tail-light functions inside one sealed LED lamp assembly.

The Super 44 family is available in multiple configurations. Depending on the part number, the lamp may use a grommet mount, permanently attached flange, stainless-steel security flange, standard sealed connector, hardwired lead, heated lens, or integrated backup-light section.

LEDs illuminate faster than incandescent bulbs and do not use fragile filaments. This helps the lamp withstand vibration while reducing electrical demand and routine bulb replacement. Exact voltage, diode count, connector, mounting style, photometric rating, warranty, and dimensions must be confirmed using the individual Truck-Lite part number.

Key Characteristics

  • Four-inch round commercial-vehicle lamp
  • Combined stop, turn-signal, and tail-light functions
  • Sealed LED construction
  • Red lens for rear vehicle installation
  • Polycarbonate or application-specific lens construction
  • Low electrical demand compared with many incandescent lamps
  • Fast LED illumination
  • Resistance to shock and vibration
  • Grommet- and flange-mount configurations
  • Fit ’N Forget sealed connection options
  • 12- and selected 24-volt versions
  • Heated-lens and integrated-backup configurations available
  • Application-specific DOT, SAE, FMVSS 108, and CMVSS 108 compliance listings

Major Components

  • Red outer lens
  • LED light sources
  • Internal circuit board
  • Electronic driver components
  • Reflective or optical elements
  • Sealed lamp housing
  • Rear electrical connection
  • Mounting grommet or flange
  • Connector seal
  • Ground, tail-light, and stop-turn circuits
  • Heating element on heated configurations
  • Clear backup-light section on combination configurations

Product Type and Construction

The Super 44 is a sealed LED lamp assembly. Its LEDs, circuitry, optics, housing, and lens are integrated into a unit that is replaced as an assembly rather than serviced with an individual replacement bulb.

Standard stop-turn-tail versions normally use a red lens. Depending on the configuration, the mounting flange may be molded polycarbonate or stainless steel. Combination models use red and clear lens areas to add a backup-light function within the same four-inch-round package.

How the LED Lamp Works

The lamp receives vehicle-system voltage through separate ground, tail-light, and stop-turn circuits. Internal electronics regulate power to the LEDs and activate the appropriate light output for the selected vehicle function.

With the tail-light circuit energized, the lamp produces its lower-intensity running-light output. Applying the service brakes or activating the applicable turn signal commands a brighter output. During a turn indication, the vehicle’s flasher or electronic lighting controller switches the brighter circuit on and off.

Combination versions include additional LEDs and circuitry for white backup illumination. Heated versions add a heating element intended to reduce snow and ice accumulation on the lens.

Position and Function Within the Vehicle

The Super 44 is installed at the rear of a truck, tractor, trailer, bus, or vocational vehicle. Lamps are normally positioned symmetrically on the left and right sides so following traffic can recognize braking and turning commands.

The stop-light function warns that the vehicle is braking. The turn-signal function communicates the intended turning direction, while the tail-light function identifies the rear of the vehicle during nighttime operation and other conditions requiring lights.

Common Specifications

  • Product Series: Truck-Lite Super 44
  • Lamp Shape: Round
  • Common Lamp Size: Four inches
  • Lighting Technology: LED
  • Standard Lens Color: Red
  • Combination Lens Color: Red and clear on integrated-backup versions
  • Common Voltage: 12 volts
  • Additional Voltage: Selected 24-volt models
  • Mounting: Grommet or flange mount, depending on configuration
  • Connection: Fit ’N Forget sealed connection, PL-3-compatible arrangement, AMP-style connection, four-pin connection, or hardwired lead depending on model
  • Construction: Sealed lamp assembly
  • Diode Count: Configuration-specific; examples include 6-, 8-, 17-, and 42-diode arrangements
  • Compliance: Part-number-specific FMVSS 108, CMVSS 108, DOT, and SAE listings

Current draw, dimensions, warranty, photometric classifications, connector design, mounting hardware, and regulatory listings must be confirmed using the exact Truck-Lite part number.

Voltage, Current Draw, and Light Output

Most North American Super 44 applications use a nominal 12-volt electrical system, although selected 24-volt versions are available. A lamp must be matched to the vehicle voltage and connector arrangement.

LED configurations generally draw less current than comparable incandescent lamps. Exact stop, turn, tail, backup, and heater-circuit current varies by model. Heated versions require additional electrical capacity because the heating element operates separately from the normal LED load.

Stop, Turn, and Tail-Light Performance

The lamp produces separate intensity levels for tail-light and stop-turn operation. Its tail function supplies lower-intensity rear identification, while braking or turn-signal commands activate the brighter output required to attract attention.

LEDs reach full output more quickly than incandescent filaments. Truck-Lite states that this faster illumination can provide following drivers with additional reaction distance. Actual visibility also depends on correct installation, lens condition, voltage, viewing angle, weather, and vehicle cleanliness.

Lens, Optics, and Visibility

The lens and internal optics distribute light through the viewing angles required for the lamp’s approved functions. Standard stop-turn-tail versions use a red lens, while integrated-backup versions combine red and clear optical sections.

Visibility can be reduced by dirt, road film, snow, ice, paint overspray, physical damage, or an incorrectly positioned lamp. Cleaning should use materials that will not scratch or chemically attack the lens.

Housing, Circuit Board, and LED Design

The LEDs and electronic components are contained inside the sealed housing. Eliminating a replaceable filament helps the lamp tolerate the vibration and impacts common in commercial-vehicle service.

If internal electronics, LEDs, lens seals, or the housing fail, the lamp is generally replaced as a complete assembly. Opening or drilling the sealed housing can allow moisture intrusion and invalidate its compliance or warranty.

Electrical Connection and Circuit Integration

Connection design varies across the Super 44 family. Common configurations include Truck-Lite Fit ’N Forget sealed connections, PL-3 arrangements, AMP-style connections, four-pin connectors, and hardwired leads.

The connector must supply the correct ground, tail-light, and stop-turn circuits. Combination backup versions require an additional circuit. Terminal locations should be verified before connecting a replacement lamp because physical fit alone does not establish correct circuit compatibility.

Grounding and Voltage Management

A stable ground and adequate supply voltage are necessary for normal lamp operation. Excessive resistance in a connector, splice, harness, ground circuit, or trailer electrical interface can cause dim output, flickering, intermittent operation, or complete lamp failure.

Voltage-drop testing under load is more useful than relying only on an unloaded voltage reading. A corroded circuit may display system voltage with no load but fail when the lamp attempts to draw current.

Heated-Lens Operation

Selected Super 44 versions include a heating element intended to prevent or reduce ice and snow accumulation during severe winter operation. These models require the correct connector, control arrangement, and electrical capacity.

A heated lamp should not be installed as a direct replacement for a non-heated model without verifying wiring, current capacity, circuit protection, and vehicle compatibility. The heating element does not eliminate the need for normal lamp inspection and cleaning.

Mounting and Installation

Installation depends on whether the lamp uses a grommet or flange mount. A grommet-mounted lamp fits into a correctly sized opening with a compatible mounting grommet. A flange-mounted version attaches through its integrated or separate flange system.

Installation should include:

  • Confirming the exact lamp part number and voltage
  • Inspecting the mounting opening for damage or distortion
  • Using the correct grommet, flange, plug, and sealing components
  • Cleaning corrosion and debris from the electrical connector
  • Routing wiring away from sharp edges, heat, and moving components
  • Fully seating and securing the connector
  • Positioning the lamp upright when orientation is specified
  • Testing tail, stop, turn, and backup functions as applicable
  • Confirming operation from normal rearward viewing angles

Vehicle Body and Mounting Compatibility

The mounting panel must accept the selected lamp’s four-inch-round configuration and provide adequate rear clearance for the housing and connector. A flange-mounted lamp cannot always replace a grommet-mounted lamp without changing hardware or the mounting surface.

Compatibility depends on:

  • Mounting-hole size and shape
  • Panel thickness and structural condition
  • Grommet or flange arrangement
  • Available depth behind the lamp
  • Connector type and wiring length
  • Vehicle-system voltage
  • Required lamp functions
  • Required compliance and photometric classifications
  • Exposure to snow, ice, impact, or theft

Vehicle and Electrical-System Compatibility

The lamp must match the vehicle’s voltage, circuit assignments, connector, mounting arrangement, flasher or lighting controller, and required rear-lighting functions.

Some electronic controllers monitor lamp current and may respond differently to low-current LEDs than to incandescent bulbs. Approved load-management components, compatible flashers, or controller programming may be required when converting an older vehicle to LED lighting.

Common Applications

  • Class 7 and Class 8 tractors
  • Commercial straight trucks
  • Dry-van trailers
  • Refrigerated trailers
  • Flatbed and platform trailers
  • Tank trailers
  • Dump trailers
  • Vocational trucks
  • Municipal vehicles
  • Commercial buses
  • Emergency and service vehicles
  • Specialized commercial equipment

Advantages

  • Combines three required rear-lighting functions
  • Fast LED illumination improves signaling response
  • Lower current draw than many incandescent lamps
  • No fragile incandescent filament
  • Strong resistance to shock and vibration
  • Sealed construction protects internal components
  • Long service potential
  • Multiple mounting and connection choices
  • Four-inch-round format supports common commercial-vehicle installations
  • Heated-lens models support severe winter service
  • Combination models can include backup lighting
  • Security-flange options can discourage lamp theft

Limitations or Considerations

  • The complete sealed lamp is normally replaced after internal failure
  • Part numbers vary by voltage, connector, mount, diode count, and function
  • Physical size alone does not establish compatibility
  • LED conversions may require compatible flashers or electronic controls
  • Heated versions require additional electrical capacity
  • Damaged connectors or wiring can cause a replacement lamp to malfunction
  • Lens contamination can reduce visibility
  • Incorrect mounting can compromise compliance and viewing angles
  • Warranty coverage differs among configurations
  • Integrated-backup models require an additional circuit

Driver and Operator Experience

The lamp normally requires no driver adjustment. Its condition is confirmed during the pre-trip inspection by operating the tail lamps, service brakes, turn signals, hazard flashers, and backup lamps where applicable.

Drivers should report dim output, rapid or abnormal flashing, intermittent operation, warning messages, water inside the lamp, cracked lenses, damaged mounts, or lamps obscured by dirt, snow, or ice.

Inspection and Wear Points

  • Red or red-clear lens
  • Lamp housing and rear shell
  • Mounting grommet
  • Flange and mounting hardware
  • Electrical connector and terminal fit
  • Connector seal
  • Ground circuit
  • Wiring near the rear body or trailer sill
  • Harness clips and strain relief
  • Heating circuit on heated models
  • Evidence of water intrusion
  • Signs of impact, theft, or tampering

Testing and Electrical Diagnosis

Diagnosis should first determine whether the fault affects the tail circuit, stop-turn circuit, ground, backup circuit, heater circuit, or complete lamp. The opposite-side lamp can provide a useful operational comparison, but parts should not be exchanged without confirming connector and part-number compatibility.

Testing may include:

  • Verifying source voltage at the lamp connector
  • Performing supply-side voltage-drop testing
  • Performing ground-side voltage-drop testing
  • Inspecting terminals for corrosion or loss of tension
  • Checking the vehicle fuse or circuit breaker
  • Testing the tractor-to-trailer electrical connection
  • Checking flasher or lighting-controller operation
  • Testing heater-circuit current on heated lamps
  • Inspecting wiring for shorts, abrasion, and broken conductors

Lamp, Connector, and Wiring Service Life

LED service life depends on voltage quality, heat, vibration, sealing, installation, connector condition, environmental exposure, and physical damage. The absence of a filament removes one common failure point but does not make the lamp immune to electrical or mechanical problems.

Connectors, grommets, wiring, and mounting hardware may require service before the sealed LEDs fail. Replacing the lamp without correcting high resistance, loose mounting, damaged wiring, or water intrusion may result in another failure.

Maintenance and Ownership Notes

Clean the lens regularly and inspect operation during every required vehicle inspection. Keep electrical connectors fully seated, wiring properly supported, and mounting components secure.

Do not drill, open, paint, or apply an opaque coating to the lamp. Replacement should use the correct voltage, function, connection, mounting style, compliance rating, and part number.

Common Electrical and Lighting Problems

  • Lamp does not illuminate: Loss of power, poor grounding, a disconnected plug, damaged wiring, failed electronics, or an open protective device may be responsible.
  • Tail function works but stop-turn does not: A separate circuit fault, connector-terminal problem, wiring failure, controller issue, or internal lamp failure may affect the higher-intensity function.
  • Dim output: Voltage drop, poor grounding, corroded terminals, low system voltage, or a contaminated lens can reduce visible output.
  • Intermittent operation: A loose connector, reduced terminal tension, broken conductor, vibration-related fault, or moisture intrusion may interrupt the circuit.
  • Rapid turn-signal flashing: An incompatible flasher, failed lamp, open circuit, electronic load-monitoring issue, or LED conversion problem may alter flash rate.
  • Water inside the lamp: A cracked lens, damaged housing, failed seal, or physical impact may have compromised the sealed assembly.
  • Lamp falls out of its mounting: An incorrect, hardened, torn, or improperly installed grommet may no longer retain the lamp.
  • Heated lens does not clear: A failed heating element, incorrect connection, insufficient voltage, blown fuse, damaged wiring, or incompatible installation may prevent heater operation.

Safety and Service Precautions

Secure the vehicle before inspecting or servicing rear lighting. Follow the vehicle and lamp manufacturers’ procedures and use electrical test equipment suitable for the circuit.

  • Disconnect electrical power when repairing damaged wiring
  • Do not short connector terminals during testing
  • Never substitute a larger fuse for the specified protection
  • Do not look directly into high-output LEDs at close range
  • Support trailer bodies and raised equipment before working underneath them
  • Protect wiring from exhaust heat, sharp edges, and moving components
  • Restore connector seals and strain relief after service
  • Test every lamp function before returning the vehicle to operation

Identification Information

Product identification is normally molded, printed, or labeled on the lamp housing, lens, connector area, packaging, or vehicle build documentation.

Record the following information before ordering a replacement:

  • Complete Truck-Lite part number
  • Super 44 or 44 Series identification
  • System voltage
  • Stop-turn-tail or combination function
  • Lens color
  • Grommet- or flange-mount design
  • Connector or hardwired configuration
  • Diode arrangement
  • Heated or non-heated design
  • Compliance markings
  • Required plug, grommet, flange, or installation kit
  • Vehicle or trailer manufacturer and model

Buying Considerations

  • Confirm the complete Truck-Lite part number
  • Match the vehicle’s 12- or 24-volt electrical system
  • Choose standard stop-turn-tail or integrated-backup operation
  • Select grommet or flange mounting
  • Verify mounting-opening dimensions and rear clearance
  • Match the electrical connector and circuit arrangement
  • Determine whether a heated lens is required
  • Confirm required SAE and regulatory classifications
  • Check whether the plug, grommet, flange, or mounting kit is included
  • Compare warranty coverage between configurations
  • Inspect the existing wiring before installing a new lamp
  • Confirm compatibility with electronic flashers and lamp monitoring

Variants and Configurations

  • 12-volt stop-turn-tail lamps
  • 24-volt stop-turn-tail lamps
  • Six-diode configurations
  • Seventeen-diode configurations
  • Forty-two-diode configurations
  • Grommet-mounted lamps
  • Flange-mounted lamps
  • Stainless-steel security-flange lamps
  • Black, white, gray, or metallic trim configurations
  • Fit ’N Forget sealed connections
  • PL-3 connection arrangements
  • Hardwired configurations
  • Heated stop-turn-tail lamps
  • Integrated stop-turn-tail and backup lamps
  • Individual lamps and installation kits

Comparison to Similar Equipment

Compared with a four-inch incandescent stop-turn-tail lamp, the Super 44 LED normally illuminates faster, draws less current, and eliminates the filament that commonly fails from vibration. The sealed LED assembly is normally replaced as a unit rather than repaired with a new bulb.

Compared with the Truck-Lite Super 60 LED Stop-Turn-Tail Lamp, the Super 44 uses a round four-inch format instead of a two-by-six-inch oval design.

Compared with a separate backup lamp, the Super 44 integrated stop-turn-tail and backup version combines red and white functions inside one housing. The combination model requires the correct four-circuit connection and should not be confused with the standard three-function lamp.

Best Fit For

  • Vehicles designed for four-inch-round rear lamps
  • Commercial fleets replacing incandescent rear lighting
  • Trailers exposed to frequent vibration
  • Vehicles needing lower-current LED lighting
  • Operations seeking sealed rear-lamp construction
  • Winter fleets needing heated-lens options
  • Applications requiring integrated backup lighting
  • Fleets using Truck-Lite sealed electrical connections
  • Vehicles needing flange, grommet, or security-mount choices

Related Vehicle and Trailer Types

Related Truck and Trailer Models

Related Electrical System Types

Related Electrical Products

Related Equipment Systems

Related Guides

Regulatory and Compliance Notes

Commercial vehicles must maintain the rear lamps and signaling functions required for their vehicle type, dimensions, and operating jurisdiction. The selected Super 44 part number must carry the appropriate markings and classifications for its installed position and intended function.

Mounting height, horizontal placement, visibility, color, quantity, spacing, orientation, and electrical operation must comply with applicable vehicle requirements. A compliant lamp can become noncompliant if installed in the wrong position, obscured by equipment, wired incorrectly, or used for a function it was not approved to perform.

Real World Operating Notes

When one function fails but others continue operating, technicians should test the individual circuit before replacing the lamp. Stop-turn and tail functions use separate power paths even though they share one housing.

A new lamp will not correct low voltage, poor grounding, damaged trailer wiring, a defective tractor receptacle, or an incompatible flasher. Connector and circuit testing should be completed before condemning the sealed assembly.

Winter fleets should keep lenses clean even when heated lamps are installed. Heavy accumulation, freezing rain, road film, and packed snow may still reduce visibility.

Frequently Asked Questions

What is the Truck-Lite Super 44?

It is a family of four-inch round sealed LED lamps designed primarily to provide commercial-vehicle stop, turn-signal, and tail-light functions.

Does every Super 44 lamp have the same specifications?

No. Voltage, diode count, connector, mounting method, lens material, depth, flange design, warranty, and additional functions vary by part number.

Is the Super 44 a replaceable-bulb lamp?

No. The LED versions are sealed assemblies and are normally replaced as complete lamps after an internal failure.

Is the Super 44 available for 24-volt vehicles?

Yes. Selected 24-volt configurations are available, but most North American truck and trailer applications use 12-volt versions.

Can it replace a four-inch incandescent lamp?

It may be suitable when the voltage, connector, mounting dimensions, functions, photometric requirements, and electronic controls are compatible.

Does Truck-Lite offer a heated Super 44?

Yes. Heated versions use an integrated heating element to help control snow and ice buildup in severe winter weather.

Is a backup light available in the same housing?

Yes. Selected Super 44 combination lamps integrate stop, turn, tail, and backup functions in one four-inch-round assembly.

Why does an LED turn signal flash too quickly?

The vehicle may have an incompatible flasher, electronic load monitor, open circuit, poor connection, failed lamp, or wiring problem.

How is the correct replacement identified?

Use the complete Truck-Lite part number and confirm voltage, function, lens, mounting style, connector, heating capability, compliance markings, and required installation hardware.

Availability and Where to Find

Truck-Lite Super 44 lamps may be available through Truck-Lite distributors, commercial-truck dealers, trailer dealers, fleet-parts suppliers, heavy-duty electrical specialists, and online commercial-vehicle parts sellers.

Availability varies by voltage, mounting design, connector, diode arrangement, lens type, heating capability, integrated functions, and part number. Current specifications and distributor information are available through the Truck-Lite website.

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