Partsam 4" Red LED Stop/Turn/Tail Flange-Mount Light - 2PCS, 12-Diode Waterproof

Partsam 2PCS 4" red flange-mount LED stop/turn/tail lights are sealed, waterproof 12-diode lamps designed for trucks, trailers, RVs and boats.

These compact 4-inch lamps combine a durable acrylic lens and molded housing with a simple three-wire harness to give clear stop, tail and turn signaling from a flange-mounted assembly. The pair is sonic-welded into a single waterproof unit so the lights withstand road spray and wet environments. Note: each lamp functions either as a tail light (low) or as a stop/turn light (high), not both simultaneously; wiring determines the active mode.

How rugged are these lights for outdoor and marine use?

The Partsam housings and lenses are molded and sonic-welded into a single sealed unit to resist moisture and corrosion from exposure. The construction keeps the electronics dry and reduces maintenance needs, making them suitable for boats, trailers and trucks operating in wet conditions.

• Sealed waterproof acrylic lens and molded plastic housing for weather resistance
• Corrosion-resistant materials optimized for salt spray and road grime
• Sonic-welded lens to housing for long-lasting seal integrity

How do I wire and install the flange mount lights?

Installation uses a three-wire hardwired harness: white is ground, black provides the low-brightness tail function, and red delivers the high-brightness stop/turn signal. The flange-mount design accepts the lamp with a 105 mm hole spacing and secures with common fasteners, making retrofit straightforward on vehicles with matching cutouts.

• Three-wire hookup: white = ground, black = low/tail, red = high/stop-turn
• Outer diameter 140 mm, inner diameter 105 mm, height 24 mm for compatibility checks
• Hole distance 105 mm (4") to align with 4" flange openings

What light output and functionality should I expect?

Each lamp contains 12 LEDs that produce bright red signaling for clear visibility. They act as either a low-intensity tail lamp or a higher-intensity stop/turn lamp depending on which wire receives power, so choose wiring based on the vehicle’s desired function for each fixture.

• 12 diodes per lamp for bright, even illumination
• Selectable brightness via wiring (low for tail, high for stop/turn)
• Red lens optimized for legal and visible rear signaling

Will these lights fit my trailer or RV without modification?

Measure your current flange opening and hole spacing before purchase; these lights are designed around standard 4" (105 mm) inner diameter and 105 mm hole distance. If your vehicle uses a similar 4" flange or planned cutout, installation should be direct; otherwise, a small adapter or new mounting plate may be necessary.

• Designed for 4" inner diameter openings and 105 mm hole spacing
• Compact 24 mm height minimizes protrusion from mounting surface
• Common flange dimensions suit many trucks, trailers, RVs, and boats

Who is this for? These Partsam 4" red flange-mounted LED lamps are intended for vehicle owners, fleet managers, and DIY mechanics who need compact, weatherproof rear signaling lights for trucks, utility trailers, RVs, and boats. They suit anyone replacing worn incandescent fixtures with low-maintenance LEDs, or adding clear, sealed stop/turn/tail signals where space is limited. Confirm your mounting hole pattern and wiring plan before installation to ensure you achieve the desired tail or stop/turn function.