Partswcgg 4" Round LED Trailer Tail Lights 10-Pack Red — 12-LED, IP65 Flush-Mount

Partswcgg 10-pack 4-inch round LED trailer tail lights are a set of bright, low-current red 12-LED assemblies designed for flush-mounting on 12V trailers and trucks, supplied with rubber grommets and 3-prong pigtails for straightforward installation.

These round LED tail lights combine a compact 4" inner lens with a 5-1/8" outer grommet ring to deliver stop, turn, brake and running-light functions in a single unit. Built to fit standard trailer cutouts and to resist weather exposure, the lamps use 12 efficient LEDs each to produce strong visibility while drawing less power than incandescent bulbs. The set includes ten matching lamps and the wiring harness ends for easier hookup.

How do these lights mount to a trailer?

The fixtures are designed for flush installation using the included rubber grommet rings. You’ll need a roughly 4-1/2" hole for the grommet to seat properly and 1-3/16" depth clearance behind the panel.

• Use a 4-1/2" hole saw for a clean opening.
• Insert the light into the rubber grommet for a tight, vibration-resistant fit.
• Push the assembly into the trailer body until the grommet sits flush.
• Connect the 3-prong pigtail to the vehicle wiring or standard trailer plug.

What wiring colors and functions should I expect?

Wiring is color-coded for quick hookup: white is ground, red is the high-brightness feed, and black is the low/steady light circuit. Each lamp supports stop/turn/brake and running functions when wired to a standard 12V trailer system.

• White — chassis ground connection.
• Red — high brightness (stop/turn/flash feed).
• Black — low brightness / running light feed.
• Accepted by 3-prong standard trailer connectors for compatibility.

Are these lights weatherproof and what vehicles are they for?

The housings meet IP65-level protection, shedding rain and road spray, but they are not intended for continuous submersion. They work with almost any 12V vehicle that uses round, flush-mount tail lamps.

• IP65-rated for dust and water spray resistance (not waterproof for underwater use).
• Suitable for semi-trailer, utility trailer, horse trailer, enclosed trailer, pickup, UTV and similar 12V systems.
• 12 efficient LEDs per lamp for brighter light with lower current draw.
• Flush-mount profile reduces snagging and protects the lens on rough roads.

How do I choose and install for long-term reliability?

Pick locations with enough rear clearance for the 1-3/16" thickness and ensure grommets are fully seated to keep moisture out. Use proper crimp connectors or waterproof butt-splices on the pigtails to maintain a durable electrical connection.

• Verify 4-1/2" hole spacing and 1-3/16" depth before cutting panels.
• Seal edges with silicone if mounting on thin metal for extra protection.
• Use corrosion-resistant connectors and route wires away from sharp edges.
• Test functions (stop, turn, running) before finalizing installation.

Who this is for: Installers, fleet managers and DIY trailer owners who need a bulk supply of dependable, low-draw red tail lights for multiple trailers or heavy-equipment fleets. If you want a flush-mount LED solution that replaces incandescent lamps with a compact, weather-resistant assembly and simple three-wire hookup, this 10-piece Partswcgg kit covers standard trailer applications and routine maintenance projects.