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Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Amber Lens

Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Amber Lens

Item # MC38AB
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Optronics Trailer Lights - MC38AB
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4" x 2-1/16" Oval. Incandescent trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Surface mount - hardware not included. 1-Wire design. P2 rated. Lowest Prices for the best trailer lights from Optronics. Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Amber Lens part number MC38AB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (115)
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Optronics Trailer Lights - MC38AB

  • Clearance Lights
  • Oval
  • Incandescent Light
  • Amber
  • 4L x 2W Inch
  • Surface Mount
  • Rear Clearance
  • Side Marker
  • Non-Submersible Lights
  • Optronics

4" x 2-1/16" Oval. Incandescent trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Surface mount - hardware not included. 1-Wire design. P2 rated.


  • Oval trailer light functions as either a side marker or clearance light when properly mounted
  • Built-in reflex reflector removes the need for a separate reflector
  • Incandescent bulb can be easily replaced
  • Durable ABS plastic base
  • Amber snap-on lens over incandescent bulb
  • Compatible with 12V DC electrical systems
  • Surface mount on trailer - hardware not included
  • Single wire design grounds through mounting hardware
  • DOT compliant
  • P2 rated


  • Overall dimensions: 4" long x 2-1/16" tall x 1-3/16" deep
  • Distance between mounting holes (center on center): 3"
  • Bulb type: 194
  • 3-Year warranty

Manufacturer Cross Reference
Light will work as an exact replacement for:
Uni Bond # ML2042A
Truck Lite # 26304Y
Grote # 46703
Peterson # 108WA

Optronics MC38 Series Incandescent Amber Marker Clearance Light Dimensions

P2-Rated Lights

Diagram of light spread for P2 rated light

A P2-rated light produces a 45-degree angle of light to either side of its centerline for a total of 90 degrees of coverage. This beam pattern can be seen straight on, but it cannot be seen clearly from the side. So this type of light can be used as either a side marker light or a clearance light, but it cannot function as both. If you need both functions, then you must install 2 separate lights on your trailer - one as a front or rear clearance light and one as a side marker light.

MC38AB Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Amber Lens - P2 Rated

Alternate part number: MC-38AB

California residents: click here

Customer Reviews

Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oval - Amber Lens - MC38AB

Average Customer Rating:  4.9 out of 5 stars   (115 Customer Reviews)

4" x 2-1/16" Oval. Incandescent trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Surface mount - hardware not included. 1-Wire design. P2 rated.


The products I bought form etrailer are superior to what I replaced on my 1988 stock trailer. The clearance lights both red and amber have a good grounding and 12v supply lugs. Solid lugs for positive connections unlike the old two piece units where the ground and positive connection fails between two cheap movable parts.
I'm very happy with the quality and construction of these lights.
I also ordered the 3 diode ID light bar looks good and works good.
On line ordering is fast and easy and delivery was three days to the west coast which is greatly appreciated thank you everyone at etrailer you do a superb job!!

All lights still work as new, good product.
M - 07/18/2019


I was hoping they would be identical to the ones currently on our trailer but they aren't quite the same (blockier). Also, the original TT clearance lights have 2 wires coming off of the bulb socket and these only have one. They are intended (I assume) to use the screw that holds the base on as a ground connection to the trailer. That wouldn't work on our TT so I added a ground wire myself. I guess I should have seen the single wire in the picture but I missed that...


I’m very happy with the clearance lights they work perfectly and they are bright and I am planning to replace all my clearance lights on the trailer and L I will continue To buy all my trailer needs with very happy with everything


Does what's on the tin, make sure you put ground on the screw that goes through a contact or you might have a bad time


It came without a bulb


Lights were an exact replacement and matched the pictures perfectly. I had ordered some other lights (slightly cheaper) from another online retail giant (starts with A) but I was disappointed with quality and would need to be modified to fit my application. I should have just started here at etrailer.


just as advertised, worked right out of the box, easy to connect, no issues.


I just needed a lens but the price of the complete light assembly was just about what the replacement lens was, and not knowing if the lens would fit my base, I bought the whole assembly. Turns out the lens fit tightly on my existing base. The light is well made and I expect it to last as long , or longer, than the original.


the lights were easy to install and worked perfectly!


I appreciate the professionalism and integrity of the people at etrailer. In a recent order I placed I was delayed in thoroughly checking the contents of my order. I was still well within the 60 days. When I did look through the box I discovered I had not received an item. I'm thankful the company believed me and sent me the parts I had not received. I recommend etrailer and will shop with them again.


Just what I thought I order, fast very timely


Product was an exact replacement. I had difficulty locating this part locally but because of the great pictures and details on the site I was able to locate it. It was shipped promptly and would definitely recommend this company.


The clearance lights are a perfect matching replacement for the Bargman and Peterson brands that were used on the 80's RV's like my Allegro. The price was so good I decided to replace all 20 clearance lights


Very fast delivery, I didn't use the light only the reflector which came off easily. I used the reflectors which we're the exact same size to fit on the front of my 2011 Honda CRV-LX which did not come with the small parking lights but only had the cut outs for them, now the front looks real sharp after I glued the reflectors into the voids.


I needed a replacement lens for two of my clearance lights on an old RV. The lenses from this item fit the original mount and at the price I would expect to pay for just a lens.
It took a lot of searching and sleuthing to find these because there is no reference to the DOT number or the manufacturers number for the lens in the description.
Delivery was very prompt. Better than I expected.


Purchased trailer lights to replace old ones. These arrived in a few days, even with economy shipping and were exactly what I wanted.


Ordered missing/replacement Trailer Clearance side-light. Did not find it locally. Quickly found it on the etrailer web site for a good price. It was quickly delivered and "just what the doctor ordered".
Dr Dan


The product itself was great, i would have liked it better if mounting screws were included with the side markers. other then that i am very happy, and they work very well.


The products I received are exactly as represented on the website. They appear to be of the high quality that I have come to expect from e-trailer. I have ordered numerous things from them over the years and these were shipped promptly and received in a short period of time as is always the case when I order from e-trailer.


Great replacement to match existing trailer clearance light configuration. Ordering was easy and shipping was quick.


Easy replacement


Great Ball Mount
Raised the trailer
towing height so now the trailer is level when towing


This light fit perfectly "inside" the light I needed to replace.

Have not had any issues with the trailer lights.
Doreen P - 01/19/2018


Quick fix for our trailer, and fit perfectly. It's amazing what something so small can do to improve the look of a very "vintage" trailer.


These connectors are great trailer wiring connections.

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • Replacement Oval Amber Light for a Triton Trailer Frame
    We do have a selection of oval amber light assemblies that could fit, but you will need to first find out the dimensions of the light that you mentioned to make sure you get a replacement that is compatible. You can then filter through our linked selection of oval amber light assemblies. For example; the Optronics Oval Trailer Clearance, Side Marker Light with Reflector # MC38AB matches the oval and amber description, and it measures 4" Long x 2-1/16" Wide x 1-5/32" Deep.
    view full answer...
  • Length of Wire on the Oval Trailer Clearance, Side Marker Light with Reflector # MC38AB
    The length of the attached wire on the Oval Trailer Clearance, Side Marker Light with Reflector # MC38AB that you referenced is 4 inches.
    view full answer...
  • Clearance Light Recommendation for Trailer # MC38AB or # MC31AB
    Between the clearance lights # MC38AB and # MC31AB the difference is mainly aesthetic. I personally like the black base and rounder edges of the # MC31AB so that is what I would go with. You would need to use bolts or screws to secure the base of the light to the trailer and then pop the lens on top of it to install it.
    view full answer...
  • Replacement Clearance Lights with Reflectors for 1998 Coleman Cheyenne Pop-Up Camper
    For your 1998 Coleman Cheyenne the clearance lights with reflectors you need are most likely the Oval Trailer Clearance, Side Marker Light with Reflector - Amber # MC38AB or the rounded rectangular # MC32AB. Both of these options are 4 x 2 inches and look like what you need based on the photos I can see online. I've attached the links to the light bulbs and amber lenses that we carry for you to compare if you simply want to replace the bulb and lens.
    view full answer...
  • Replacement Amber Lens for Trailer Clearance Light Like MC38AB
    Trailer side marker light have only that one function so this means that the two wires on your lights serve as ground and power. Some such trailer lights can have only 1 wire if they happen to use their mounting hardware to make the ground connection to the trailer. We do offer a whole range of replacement lenses for lights in all sports of shapes, colors and sizes. You can see all replacement lenses by clicking on the link provided. Just click on the color (amber, in this case), shape...
    view full answer...
  • Clearance Light Lens Recommendation for 1993 Bounder RV
    Thanks for the picture of the clearance light you have. It looks to be a part # MC38AB so that means the replacement lens is the part # A38AB.
    view full answer...
    Image 1 for
  • Replacement Lens Recommendation for Clearance Light # MC38AB
    For the Optronics clearance light part # MC38AB we have the lens part # A38AB that you referenced which the pricing is available below at the attached link.
    view full answer...
  • Replacement Side Marker Lights for Southwind RV
    If the Glo-Brite 446A/R side marker lights on your Southwind RV are 4" long x 2" wide you can use # MCL31AB if you need LED lights or you would use # MC38AB for an incandescent replacement. If your Southwinds RV has a different sized or color light, please let me know or send a picture and I can help you find the appropriate replacement light.
    view full answer...
  • Are 4" Oval Peterson and Optronics Clearance Lights the Same Dimensions
    They are not the exact same shape but they basically have the same dimensions with the differences being within 1/16" of each other (which could be the difference between manufacturer's preference for measurements). For the amber version of the Peterson Light # 423000 you need part # 422800 and for the red version of the Optronics Light # MC38AB you need part # MC38RB. Either way thought these lights are interchangeable with each other.
    view full answer...
  • Trailer Taillight Lens Recommendation for Lights Marked SAE-AP2-79
    So SAE numbers aren't part numbers so it's hard to pick out replacement lights based on of them since that's not info that's stored as a cross reference. We've had customers with a similar number SAE-AP2-79 which turned out to be the # 423000 for red and then for amber part # MC38AB. For just the amber lens you'd need the part # A38AB. For just the red lens you'd want the part # A38RB. If you have something totally difference send me a picture and I'll take a look to see what it might be.
    view full answer...
  • Red and Amber Clearance Replacement Lights for Signal Strat 77-557
    From what I could find online it looks like your Signal Stat 77-557 side markers are 4 x 2. We have some options from Optronics for you that have replacement bulbs and lens available. For Amber # MC38AB - Replacement Lens is # A38AB For Red # MC38RB - Replacement Lens is # A38RB They both use the same replacement light bulb which can be found on our site using part # A194B.
    view full answer...
  • Trailer Fender Clearance Light Recommendations
    At this time Fulton does not offer any trailer fenders that have built in clearance lights, but one could be added to the plastic fender, # F008574, easily. We have many styles of trailer clearance lights to choose from, see link, and many are surface mount so you would only need to drill two small holes for mounting and possibly a third small hole to run the wiring through. You would also need to add a ground wire to any light you choose that may be grounded with mounting hardware through...
    view full answer...
  • Replacement Trailer Clearance Lights PM-108-15 SAE-AP2-79
    We have exactly what you need. For the amber lens light you would want the Oval Clearance Light part # MC38AB and then for the red light you would want the Peterson Red Oblong Clearance Light part # 423000.
    view full answer...
  • Replacement Lens Covers for my Trailer Lens Shows SAE-AP2-79
    SAE numbers aren't part numbers so it's hard to pick out replacement lights based on of them since that's not info that's stored as a cross reference. We've had customers with a similar number SAE-AP2-79 which turned out to be the # 423000 for red and then for amber part # MC38AB. For just the amber lens you'd need the part # A38AB. For just the red lens you'd want the part # A38RB.
    view full answer...
  • Recommended Replacement Trailer Tail Light Close to 77-556R
    We do not have anything that is green, but there are many red options. Both the 77-556R & 77-556G you referenced have been discontinued. The Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 6 Diodes - Oval - Red Lens # STL12RB is probably the closest look we have.
    view full answer...
  • Most Popular Replacement Clearance/Marker Lights for an Old Travel Trailer
    The most popular clearance/marker lights we offer are the Optronics Clearance or Side Marker Lights w/ Reflex Reflector. These are offered in both incandescent part # MC38AB for amber or part # MC38RB for red and LED part # MCL31AB for amber or part # MCL31RB for red. They have a two wire design so they are super easy to install. The white wire gets grounded and then the back wire goes to the running light circuit with butt connectors part # DW05744-5. If you need screws to attach the light...
    view full answer...
  • Replacement Marker Lights for 1997 Sundowner Horse Trailer
    If you are looking to replace the entire marker light, I have located lights that will work as an exact replacements for the PM-108-15. Oval Side Marker Light with Reflector - Red, # MC38RB Oval Side Marker Light with Reflector - Amber, # MC38AB These marker lights have one bulb. If you are just needing the replacement lens, the red lens is part # 108-15R and amber lens, # 108-15A.
    view full answer...
  • Replacement Lens for Peterson F108WA Lights
    Yes, the Replacement Lens for Peterson F108WA Lights is offered in both red part # 108-15R and amber part # 108-15A. For the complete assembly you will want to use the Oval Trailer Clearance, Side Marker Light with Reflector part # MC38RB for red and part # MC38AB for amber. I have attached a review and installation video of these lights for you.
    view full answer...
  • One Wire Clearance and Side Marker Light Options to Replace Lights on Horton Hauler Trailer
    We have quite a few different options for trailer clearance lights with one wire and that will ground through the mounting hardware. These lights come in various sizes and shapes. The best replacement for your trailer will depend on the size light you are wanting to replace. For a small LED clearance light that is a stud-mount, you can use the Optronics Sealed Mini Rectangular LED Stud Mount Trailer Clearance Light. For an amber light you will want # MCL95AB and for a red light # MCL95RB....
    view full answer...
  • Replacement LED Marker/Clearance Lamps for Peterson PM130 on 1998 4Star Horse Trailer
    We offer a very similar LED clearance/marker lamp that has the same 4-13/16 inch bolt hole spread as the Peterson PM130 lamps you have. For the Red lens, use # MCL76RB or for an amber lens, use # MCL76AB. Both lamps will use the existing mounting holes, so you won't need to drill additional holes. Also recommended is the # A76GB foam gasket to prevent water from getting to the rear of the lamp.
    view full answer...
  • Replacement Lens for LED Trailer Miro Flex Taillights
    The replacement lenses for the Miro-Flex LED Trailer Tail Lights part # TLL28RK like you have are no longer available. You will instead need to replace the entire assembly using part # STL28RB for passenger's side or part # STL29RB for driver's side.
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Laura H
Updated by:
Laura H
Employee Brian T
Updated by:
Brian T
Employee Cole B
Installed by:
Cole B
Employee Randy B
Installed by:
Randy B
Employee Chris R
Video Edited:
Chris R
Employee Zach D
Video by:
Zach D

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