When space is limited, this 3-1/2" x 1-1/8" Peterson Thin Line clearance or side marker light fits in neatly. Its slim, oval shape keeps a clean look while staying out of the way. You can mount it vertically or horizontally to match your setup, and the surface-mount design makes installation simple with just two bolts spaced 2-3/4" apart. It’s a solid option when standard round or bulky lights won’t fit.
This light runs a 194 incandescent bulb that delivers dependable brightness and lasts up to 15,000 hours. Drawing only 0.25 amps at 12V, it’s efficient for its class and keeps wiring simple with a single-wire design that grounds through the mounting hardware. It’s built for consistent output whether used as a clearance or side marker light.
The high-impact base and scratch-resistant acrylic lens are made to handle bumps, road spray, and everyday wear. The snap-on red lens fits tight to guard the incandescent bulb inside, maintaining clarity and keeping debris away. It’s a sturdy setup that stays looking good after miles of use.
For safety and legal peace of mind, this Peterson light meets DOT requirements and carries a P2 rating. That means it projects light 45 degrees to either side of center for a total of 90 degrees of coverage—ideal when used as a dedicated clearance or side marker light. If you need both functions, install two lights for complete coverage that meets regulations.
If you’re swapping out worn lights, this model directly replaces Grote #45252-3, Truck Lite #1555, and Optronics #MC68RB. That makes upgrading or matching what you already have straightforward—no new holes or rewiring needed.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're taking a look at the Peterson clearance or side marker light. This is a small oval trailer light that serves as either a side marker light or clearance light on your trailer.It features a scratch resistant red acrylic lens and it sits on a high impact base. It mounts on the surface of the trailer, so you remove the lens to gain access to your mount holes. Mounting hardware, not included. It's a two mount hole design. It can be mounted horizontally or vertically.When it comes to the wiring, it's a single wire design.
So this is your power wire and then it grounds through the mounting hardware on this side of the unit. So there's a little metal tab that runs through there and as the hardware contacts that and then goes into your trailer, it grounds the unit. So single wire design, grounds through mounting hardware. It is a P two rated light and an incandescent bulb is included. Bulb number is 193.We're going to take a look at the dimensions real quick.
Then we'll hook it up to power so you can see what it looks like. Edge to edge, going this direction, measures about three and a half inches long. Edge to Edge this direction is about one and 1/8 to one and 3/16, right in that area. And then the depth measurement is about one and 1/16 inches deep.Has a nice foam gasket on the bottom. Provides some cushion at the mounting location.
The distance between our mount holes on center, these are separated on center by two and three quarter inches.We're going to go and hook it up to power. That way you can see what it looks like with power running to it and then we'll also turn off our overhead lights so you can see it in a low light setting. So you can see here that it sends out a really nice clear consistent signal. Again, it contains one incandescent bulb. Bulb number is 193.
The red lens allows plenty of light to come through and again, this functions as either a side marker light or clearance light on your trailer. That's going to do it for today's look at the Peterson clearance or side marker light.
Ratings & Reviews
Perfect replacement for Roadtrek 200 rooftop marker lights.
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EXACTLY what I needed (used on golf cart for tail lights) and perfect size, and looking good!
Direct replacement for the factory installed clearance light on my 20+ year old trailer - I was really worried about finding the correct replacement parts but etrailer.com had everything I needed. The ordering process was a breeze and my order arrived quickly
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