Jamarco Peterbilt LED Turn Signal Marker Lights, 2pc Amber 31-LED Sealed

These are two sealed 31-LED amber marker and turn signal units by Jamarco designed to replace the rectangular front turn signal lights on many Peterbilt models.

Upgrade worn or dim front signal assemblies with a pair of bright, sealed LED modules engineered for Peterbilt trucks. Each unit integrates 31 amber LEDs, is pre-wired with a three-conductor pigtail for straightforward hookup, and mounts using standard hardware. The design aims to deliver improved visibility, long life, and straightforward installation without modifying your existing headlight housing.

How do these LEDs fit into my Peterbilt headlight assembly?

These Jamarco modules are built to replace the bulb-and-lens component in dual rectangular headlight housings found on several Peterbilt models. They are shaped and sized for direct substitution so you can reuse the OEM mounting points and most factory screws.

• Compatible with Peterbilt 357, 359, 365, 378, 379 and similar dual-rectangular headlights.
• Designed as a direct replacement for the bulb-and-lens element—no new brackets required.
• Includes stainless steel mounting screws for a secure install.

What does the wiring do and how do I connect it?

Each light is hardwired with a three-wire pigtail to simplify connection to your existing harness. The wires separate running/park and turn functions so the module performs distinct high/low LED modes for visibility and signaling.

• White wire: chassis ground connection.
• Red wire: turn-signal input activating the main 21-LED turn mode.
• Black wire: park/running input enabling low or side LED illumination.

What lighting behavior should I expect on the road?

The module uses grouped LED circuits so different LEDs illuminate for turn and park modes, providing clear signaling and steady marker lighting. LEDs are positioned to emit amber light outward for maximum noticeability in traffic.

• Main front 21 LEDs light in turn (high) mode for clear signaling.
• Rear 6 LEDs and side 4 LEDs provide low-mode marker or park light illumination.
• Sealed housing resists moisture and helps prevent fogging and corrosion.

How durable and serviceable are these replacements?

Jamarco supplies these sealed LED units to withstand heavy use and exposure typical of commercial trucks. The stainless steel screws and sealed lens reduce failure points compared with exposed bulbs and lenses.

• 31 LEDs per unit for redundancy and long operating life.
• Sealed construction lowers water intrusion and lens fogging risk.
• Stainless fasteners included to resist rust at the mounting points.

Who is this for? These Jamarco 31-LED amber marker and turn signal units are intended for truck owners, fleet managers, and service technicians who need a reliable, plug-in replacement for worn or nonfunctional front turn/marker lights on compatible Peterbilt models. They suit anyone wanting brighter, lower-maintenance signaling without altering the headlight assembly, and they’re particularly useful for vehicles operating in high-mileage or exposure-prone environments.