Truck-Lite 40850 40 Series Power Unit Tail Light Module Box - Between Frame Rail Mount, 12V Incandescent S/T/T, Back-Up & License Hub

Streamline your tractor power unit's backend wiring and signaling footprint with the heavy-duty Truck-Lite 40850 40 Series Power Unit Light Module Box. Specifically designed for a flush, secure install between the rear frame rails of heavy-duty commercial trucks, this massive 32-inch wide 4-lamp steel enclosure combines multi-stage Stop/Turn/Tail (S/T/T) capabilities, a clear reverse back-up system, and integrated license plate illumination. Pre-assembled with an integrated junction box and a protective 14-gauge wiring harness, this 12V incandescent hub is the ultimate heavy-duty fleet solution.

Consolidate rear vehicle signals and safeguard structural tractor-end electronics with the Truck-Lite 40850 40 Series Power Unit Enclosure Hub. Positioned cleanly between rear frame rails, this premium assembly eliminates cluttered cross-member wiring and cluster mounts. It is heavily utilized as an OEM and aftermarket standard on long-haul semi-tractors, vocational fleets, dump trucks, and severe-duty prime movers.

The foundation of the 40850 module is a structural, heavy-gauge steel housing built to survive the high-impact environment between frame rails—deflecting flying road debris, salt sprays, mud, and intense chassis twists. The face of the unit features a high-impact black PVC trim panel housing four independent 4-inch round Model 40 sealed incandescent lamps (featuring red and clear polycarbonate lenses). This multi-functional rear signaling array simultaneously manages your primary Stop/Turn/Tail commands, white reverse back-up indicators, and license plate tracking illumination. For simplified fleet retrofits, the entire module arrives pre-wired with an integrated junction box, distributing reliable 12V power via a 4-wire, 14-gauge harness matching a straight PL-2 connector down to a secure ground ring terminal.