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When you just need a solid, dependable clearance or side marker light, this one delivers. The Peterson 4-1/16" x 2-1/16" oblong light is P2-rated for a 90-degree beam spread—perfect for meeting DOT requirements when used properly as either a clearance or side marker light. The amber lens and built-in reflex reflector help other drivers see you clearly, day or night, without needing a separate reflector.
Swapping out an older or broken light doesn’t have to mean drilling new holes. This light surface-mounts flat against the trailer and uses 3" center-to-center mounting holes for a straightforward fit where most factory lights were installed. You only need a small wiring hole, and the single-wire design grounds through the mounting hardware, keeping things clean and easy to hook up.
Built to handle regular use, the molded plastic base resists cracking and corrosion. Inside is a premium 194 incandescent bulb that can last up to 15,000 hours—plenty for years of night towing or storage yard duty. Running on 12V DC power, it draws only 0.25 amps while producing steady illumination that’s easy on your electrical system.
You don’t have to mess with adding extra reflective tape or parts. The custom-cut lens includes a built-in reflex reflector that bounces light back from headlights even when your bulb isn’t powered. It’s one less piece to install and keeps your trailer visible in all conditions.


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're gonna take a look at the Peterson oblong trailer clearance light with reflector in amber.This is going to be a great replacement or upgrade to your current trailer's clearance light. It's going to have that amber lens, so it's going to act as our side marker or clearance light, and this is going to have an easy-to-replace lens that also acts as a reflector. So it's gonna help to reflect the light as well as allow our light from our bulb to come through. And to remove the lens, it's pretty easy, you just take a flat-bladed screwdriver, place it into the little slot there that's going all the way around the edge, turn it about a quarter to a half turn, and it pops right off. So pretty easy to remove.Now we do have replacement parts for this, so if this ever becomes damaged, you can pop that off and replace it with a new one. Inside, you'll see are bulb and housing.
This is going to be a single-wire design light, so that basically means we just have one wire that we need to run to our power source. And then the light is going to sit on this plate that's going to act as the ground. That plate runs to one of our mounting holes, so when you put your hardware through there, mount it onto the frame or your trailer or wherever you're mounting this to, it will ground-out the light. So one wire for our power, the ground is gonna come from one of our mounting screws, so pretty easy there.We'll have our bulb already installed. That's going to be a 149 type, 12-volt power bulb.
This is rated for 2,500 hours, so should last for a long time. Whenever you need a bulb replacement, it's easy to place that bulb, as well. You just pull it out of its little housing carefully, and you can replace that bulb. We also have replacements for the bulb as well as the lens available here at etrailer.com.The housing just snaps back into place, so pretty easy to install. Again, we'll have our two mounting holes in the back.
Those are gonna be 3 inches apart, from center to center. The light overall is going to measure 4-and-an-eighth long, and it's gonna be 2 inches wide. And measure 1-and-one-32nd of an inch deep.I'll show you what it's going to look like whenever we have it hooked up. Hook up our power wire, and then we can place here our ground to that mounting hole where we have our plate. Turn on our power.
You'll see we get our power there. Go ahead and turn off the lights in the studio so you can get an idea of how bright that light is going to be. As you can see, we get good, constant light. It's gonna be a very bright light, but also you see that reflecting capability of the lens, so it's gonna help to keep us safe, even in the dark.This is gonna be compliant with all DOT standards, and we do have a couple little notches in the light to allow our wiring to go through so it can sit flush against the trailer, or wherever you choose to mount it.And that's gonna do it for our look at the Peterson oblong trailer clearance light with reflector in amber.
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Ratings & Reviews

Heather A.
3/17/2025
Hi Wayne, this side marker light part # 422800 grounds through the hardware. The hardware is not provided. This is a surface mount light, so we don't really have a grommet available for it. I checked the Peterson website and it doesn't look like they make a grommet for this size. Let me help you get a refund started.

Rex
12/9/2022
This has been a long term, part-time restoration project and has not been made roadworthy yet.

Cristina
7/15/2022
Still I’m great shape! No fading or cracks! Awesome product!!
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Heather A.
1/5/2021
Thank you for your review. The holes in the light for mounting are a quarter inch inside diameter. That should help you get started with finding the correct rivets. The length of the rivets depends on the thickness of the trailer wall. Since the light grounds through the hardware you will need metal rivets.