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If your trailer sees rain, wet roads, or even full submersion, this round backup light won’t let water ruin your day. The sealed housing and lens unit keep moisture out, protecting the bulb and wiring from corrosion. Designed to be waterproof and submersible, it’s built for harsh conditions like launch ramps or stormy travel days where lesser lights might fail.
Backing up in the dark can be a guessing game without enough light. This 4-5/16" diameter round backup light uses a clear lens over an incandescent bulb to put out bright, even illumination. It connects to standard 12V DC systems and gives you the visibility you need when maneuvering at night or in low-light areas.
Wiring doesn’t have to be complicated. This light accepts an industry-standard 3-prong plug so you can hook it up quickly and confidently without cutting or splicing wires. The recessed mount design keeps it tucked in cleanly, and with the proper grommet (sold separately), it installs securely for a neat, factory-style finish.
Road grime, vibration, and exposure can wear down lesser lights fast. The sturdy sealed housing on this Custer backup light keeps working trip after trip. It’s made to endure constant use and the typical bumps of towing, so you can count on consistent performance whether you’re parking at night or hauling through rough weather.

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, neighbor, Steve here with etrailer.com. Today we're looking at a Custer Trailer Backup Light. It's a submersible incandescent round, and with a clear lens. Now, this round trailer light provides backup light function. It is a sealed waterproof housing and lens unit, and you've got some protective tape here over the connector port, and they've got the dielectric grease already in there ready to go for whenever you hook this up and everything. It's compatible with 12 volts.
It's a recess mount grommet-style, so this will pop into a grommet. That grommet is sold separately. You probably already have it, but if you need a new one, we sell 'em here at etrailer.com. Now, as far as some dimensions, it is 4 5/6 inches in diameter, and about 2 3/16 inches thick. Well, that's gonna wrap it up, folks.
I'm Steven, thanks for joining me, have a good one.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
Fit perfectly
Great service, shipped quick, and the product quality and pricing were great!
Fast shipping. Good product
Still kicking!
Super fast service. Just what we ordered... Thank you!
Was glad I found these older model lights for my 05 Merhow horse trailer.
Great transaction!
Exactly what I needed. There are no gaskets included but the previous ones worked just fine
Info for this part was:
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Susan
6/11/2024
WORKING GREAT.