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

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

Part Number: MC31AB
In Stock
$2.45
Retail:$6.18
You Save: 60%
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Product Images

In Use/Installed

4" x 2-1/16". Waterproof, incandescent trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Surface mount to trailer - hardware not included. 1-Wire design. P2 rated. (1) 194 Bulb. Great Prices for the best trailer lights from Optronics. Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Oblong - Amber Lens part number MC31AB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (4127)
  • Q & A (0)
  • Photos

Optronics Trailer Lights - MC31AB

Highlights

  • Simple Mounting Setup: Surface mounts with 3" hole spacing for quick bolt-on install.
  • Built-In Reflector: Reflex reflector removes need for a separate reflective piece.
  • Reliable Visibility: P2 rating gives a 90° beam for clear front or rear marking.
  • Easy Bulb Replacement: Uses one 194 incandescent bulb for simple maintenance.
  • Durable Housing: Polycarbonate lens and base resist impact and wear.
  • 12V Compatible: Works with standard trailer wiring and draws only 0.2 amps.

Features to know about

Simple, Reliable Visibility: Amber Incandescent Clearance Light

This oblong trailer light gives you dependable brightness using a single 194 incandescent bulb that runs on 12V DC power. It draws only 0.2 amps at 12.8 volts, so it’s efficient while still producing clear, easy-to-see light. The P2 rating gives you 90 degrees of coverage—perfect for marking the side or corners of a trailer so others can see it straight on.

Built-In Reflector for Added Safety: No Extra Parts Needed

You don’t need to worry about adding a separate reflector—the lens already has one built in. That reflex reflector bounces light back to approaching drivers even when the bulb isn’t on, giving you extra visibility day or night. It’s one less thing to mount and makes the setup cleaner and more secure.

Straightforward Mounting: Surface-Mount Design with 3" Hole Spacing

Installation is simple. The light surface mounts to your trailer using bolts or screws spaced 3" apart, center to center. Once the base is secured, the amber lens snaps right into place. The single-wire design grounds through the mounting hardware, keeping wiring quick and neat without extra connectors or ground wires to deal with.

Tough Polycarbonate Build: Snap-On Lens That Lasts

The lens and housing are made from durable polycarbonate that stands up to outdoor use. The snap-on amber lens makes bulb replacement quick—just remove the lens, swap out the 194 bulb, and snap it back on. The light measures 4" long x 2-1/16" tall x 1-3/32" deep, giving you a compact but sturdy fit for consistent, reliable lighting wherever you mount it.

Specs

Dimensions

  • Overall dimensions: 4" long x 2-1/16" tall x 1-3/32" deep
  • Distance between mounting holes (center on center): 3"

Dimension diagram of Optronics MC31 Series amber trailer clearance or side marker light, showing 4-inch by 2-1/16-inch size and mounting hole spacing.

Electrical

  • Bulb type: 194
  • Power draw at 12.8 volts: 0.2 amps

Warranty

  • Warranty: 3-Year warranty

MC31AB Optronics Trailer Clearance or Side Marker Light w/ Reflex Reflector - Incandescent - Oblong - Amber Lens - P2 Rated

Alternate part number: MC-31AB





Customer Satisfaction Score:

Ratings & Reviews

4.9

4120 reviews
5 Stars
(3689)
4 Stars
(333)
3 Stars
(53)
2 Stars
(17)
1 Star
(28)
Review sort icon
4" x 2-1/16". Waterproof, incandescent trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Surface mount to trailer - hardware not included. 1-Wire design. P2 rated. (1) 194 Bulb.

by:

Great product and price.



by:

Order was complete in good shape and delivered very promptly . Thank You for the excellent service



by:

Works perfect and can't beat the price



by:

bought these for my home built trailer - great product - great price.



by:

Website easy to navigate, prices good and quick delivery. All good.



by:

Lites arrived in a timely fashion.

Good
quality, whish they were brighter.



by:

Very Happy



by:

Look good



by:

Great and fast service. Got just what I needed. I will order from you again, Thanks



by:

Work as they were intended to.



by:

I received the incorrect order. I will upload what I ordered and circled what was incorrect. All were Amber and the base was not what I ordered

Brooke M. profile picture
Etrailer Expert

Brooke M.

9/24/2024

I am sorry to hear that, Kathy. I will make sure we get you the correct lights. Be on the lookout for an email!



by:

amazing quality for price - very happy !!!!



by:

worked well,thanks



by:

great service and fast shippinggood quality. i like the black mounting instead of the traditional white



by:

Sturdy base with double mount holes for stable installation.



by:

Parts came ahead of schedule, perfect fix, easy install. Saved time vs repair and parts. I always go to etrailer for my one stop parts. Thanks



by:

Items arrived sooner than expected, installed easily and looks and functions great. I will use etrailer again and recommend .Tammi was very helpful.
Aloha from Hawaii



by:

Good quality for the price. Delivery time was excellent.
Great service on the question I had. Will buy from etrailer again.



by:

the lights were delivered on time. will be installing all 14 on my camper trailer. thanks for the help and videos they were very informative art



by:

etrailer is a good outfit, items are usually in stock and ship quickly.
The lamps are your standard one wire type that grounds to the skin of the trailer with the mounting screw. The lamp is a 194. The wire protrudes about 4" outside the back of the lamp. They appear to be mountable in any orientation.



by:

These marker lights are just perfect. Replacing all the ones on my trailer. The price is great and they work perfect!



by:

Fast delivery. Just what I wanted and described



by:

Good replacement for my cracked light l ense.



by:

easy to install and like that the contact to trailer is the ground.



by:

Prompt delivery. The side marker light could have had a longer power wire for my application. But not a show stopper.


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See what our Experts say about this Optronics Trailer Lights

  • Replacement Marker Lights for Bargman 552 on 1989 Pacer Arrow RV
    Hello James; the Bargman 552 lights you have are no longer around but we do have a similar replacement. The closest match comes from Optronics and measures 4" long x 2-1/16" tall. You can choose from the following based on LED or incandescent and color: -Optronics LED Clearance or Side Marker Light w/ Reflex Reflector - Red Lens # MCL31RB -Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Red Lens # MC31RB -Optronics LED Clearance or Side Marker Light w/...
    view full answer...
  • Picking Out Replacement Taillight Bulbs for 1990 Jayco Popup Camper
    I looked up a few pictures of a 1990 Jayco popups and found that they all seemed to have taillights like the # 30-92-003 that you referenced. This light takes a 1157 bulb like the # A1157B for an incandescent bulb. The side clearance lights appear to be the part # MC31RB for red and # MC31AB which use 194 bulbs like the # A194B.
    view full answer...
  • Measuring to Ensure Clearnace Lights Fit Yacht Club Trailer
    There is a way for you to find out if the Oblong Trailer Clearance, Side Marker Light with Reflector # MC31AB fits your 2006 Yacht Club trailer, though we do not have any parts lists for years, makes and models of trailers that would allow us to know this. Instead, you will simply need to take a measurement; Clearance Light # MC31AB is surface mounted with mounting hole spacing 3" apart on center so if your trailer has that mounting hole spacing it would work for you.
    view full answer...
    Image 1 for
  • Replacement Lens for Optronics Trailer Clearance Light MC31AB
    The lens you need is # A31AB. It fits clearance light # MC31AB which is 4 inches long, 2-1/16 inches tall, and 1-3/32 inches deep overall. Optronics has an MC and MCL series but not just an M and the lens is not replaceable on the MCL version of the light so that is why # A31AB would be the correct lens.
    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...
  • Availability of a Oval Trailer Clearance Light with a Black Base
    The closest thing we have to a version of the Oval LED Trailer Clearance, Side Marker Light # MCL31RB that you referenced with a black base in an amber and red lens would be the Red Oblong Trailer Clearance, Side Marker Light # MC31RB and the Amber Oblong Trailer Clearance, Side Marker Light # MC31AB. Both these lights have black bases, but they have incandescent bulbs instead of LEDs.
    view full answer...

Do you have a question about this Trailer Light?


Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
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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