Truck-Lite 51355 – 50 Series 2-Plug Left Hand (LH) Driver Side 416 in. Turn Signal & Mid-Turn Marker Harness (14 Gauge, Flat Cable, Right Angle PL-3 to .180 Bullet Connectors)

Keep your commercial trailers and heavy-duty fleets operating safely with the Truck-Lite 51355 50 Series Turn Signal & Mid-Turn Marker Wiring Harness. Engineered specifically for left-hand (LH / Driver Side) installation, this extra-long 416-inch (approx. 34.6 ft.) heavy-duty harness provides an extended reach designed to route cleanly through the frames of large commercial trailers, vocational trucks, and tankers.

Built to overcome the brutal over-the-road environments that heavy-duty vehicles face, the 51355 harness is constructed with thick, ultra-durable 14-gauge (14 AWG) copper conductors. This heavy-duty wire size is vital for preventing voltage drop over massive spans, ensuring your mid-turn indicators and marker lighting setups receive optimal, consistent power. Its low-profile flat cable styling lays flat along the frame, preventing unneeded bulk and shielding internal circuits from pinches or snags during fleet installation.

The harness features premium protection and heavy-duty compliance at critical termination points. One end is integrated with a Right Angle PL-3 plug style, allowing for a tight, flush fitment in narrow clearance spaces at the lamp housing interface. The opposite termination splits into standard .180 bullet terminals for secure compatibility with your vehicle's main lighting layout. This fully sealed setup locks out harmful road salt, moisture, and grime, drastically eliminating the risk of circuit failure due to continuous vehicle vibration.