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Double Bullseye Trailer Clearance, Side Marker Light, Two-Bulb - Amber
Optronics

Double Bullseye Trailer Clearance, Side Marker Light, Two-Bulb - Amber

Part Number: MC42AB
In Stock
$4.88
Retail:$10.13
You Save: 52%
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In Use/Installed

4-1/16" L x 2-1/8" W x 1-1/8" D; Corrosion resistant; replaceable lens and bulbs; surface mount on 3" centers; 1-wire; 2-bulb incandescent Great Prices for the best trailer lights from Optronics. Double Bullseye Trailer Clearance, Side Marker Light, Two-Bulb - Amber part number MC42AB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (138)
  • Q & A (0)
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Optronics Trailer Lights - MC42AB

Highlights

  • Brighter Amber Output: Dual-bulb design greatly boosts light visibility for clearance and marking.
  • Easy One-Wire Hookup: Grounds through the mounting hardware for a quick, clean install.
  • Compact Fit: Measures 4-1/16" Lx2-1/8" Wx1-1/8" D to fit standard 3" mounting centers.
  • Long-Term Use: Replaceable snap-on lens and bulbs make maintenance simple and affordable.
  • Built to Last: Molded plastic housing and durable lens resist corrosion and weather.
  • Efficient Power Draw: Each bulb uses .4 amps ( .8 amps total ) to minimize strain on your wiring.

Features to know about

Brighter Coverage When You Need It: Dual-Bulb Amber Output

When visibility matters, the dual-bulb setup on this Double Bullseye light makes a real difference. The two incandescent bulbs work together to increase total light output, giving you better coverage for clearance and side marking. Each bulb draws just 0.4 amps, so the total draw is only 0.8 amps while still putting out a strong amber signal that stands out in low-light conditions.

Built to Handle the Elements: Corrosion-Resistant Housing

Road spray and moisture are no match for its molded plastic housing and durable lens. The all-weather construction resists corrosion and protects the internal components from grime and wear. That means you get steady performance in rain or shine without worrying about rust or shorted connections.

Quick Fixes Made Simple: Replaceable Lens and Bulbs

No need to toss the whole light when a bulb burns out. The snap-on lens removes easily, giving you direct access to the replaceable bulbs. With standard parts like the 194 bulb, it’s simple to keep this light working like new without special tools or rewiring.

Clean and Simple Install: One-Wire Ground Through Mounting Hardware

Wiring doesn’t get easier than this. The single lead wire handles power, and the ground runs straight through the mounting hardware—no separate ground wire needed. The surface mount design lines up with standard 3" centers, making it a quick, direct fit on most setups.

Compact Size That Fits Right In: 4-1/16" x 2-1/8" x 1-1/8"

At just over four inches long and barely more than an inch thick, this rectangular light tucks into tight spots without sticking out awkwardly. It gives you a clean look that matches common mount patterns while keeping your trailer visible and compliant.

Specs

Electrical

  • Amperage draw: 0.4 amps per bulb (0.8 amps total)
  • Wiring: Single lead wire for power; grounds through mounting hardware
  • Bulb type: Two-bulb incandescent design
  • Replaceable bulb: Yes

Mounting

  • Mount type: Surface mount
  • Mounting centers: 3"
  • Ground type: Through mounting hardware

Dimensions

  • Length: 4-1/16"
  • Width: 2-1/8"
  • Depth: 1-1/8"

Technical diagram showing dimensions of Optronics Double Bullseye Trailer Clearance and Side Marker Light model MC42AB, amber dual-bulb rectangular light with black mounting base.

Construction

  • Lens: Snap-on, replaceable
  • Housing: Black molded plastic
  • Weather resistance: All-weather, corrosion resistant

Function

  • Light functions: Clearance light, side marker light
  • Lens color: Amber

Manufacturer Cross Reference

  • Uni Bond #: ML2040A
  • Wesbar #: 3440/3444
  • Truck Lite #: 26302Y
  • Grote #: 46793
  • Peterson #: 138A

MC42AB Amber Double Bullseye Marker, Clearance Light by Optronics, Inc.

Alternate part number: MC-42AB





Customer Satisfaction Score:

Ratings & Reviews

4.8

138 reviews
Review sort icon
4-1/16" L x 2-1/8" W x 1-1/8" D; Corrosion resistant; replaceable lens and bulbs; surface mount on 3" centers; 1-wire; 2-bulb incandescent

by:

Fast shipping nice lights.



by:

These were just what I was looking for, no more driving all over to find the right bulb for the others that thes replaced. Installation was easy. Just cut and splice



by:

GREAT REPLACEMENT LIGHTS. WELL MADE 2 BULB LAMP.



by:

Excellent product and fast shipping will use again!!!



by:

Fast service. Just the perfect replacement light for my trailer.



by:

Lights were exactly what I was looking for... Fast delivery, good price, worth the money spent...Great quality lights..(trailer lights)



by:

Easy ordering, fast shipping, prefect f it.



by:

Great product. Easy to install and the cover doesnt crack with the sun ray .



by:

A very nice look light.You cant go wrong with 2 light.With the money I saved ,I will pop in some LED lights



by:

I used these as they are a perfect replacement for 70s airstreams and they worked great- i assume they are still working great but a little bit ago i sold the trailer.



by:

Good high visibility side marker lights at a great price.



by:

Other companies would benefit to follow etrailer's practices of complete services to its customers. From pricing to installation...they seem to have it all. I've ordered several times and never have been disappointed.



by:

Replaced 40 year old clearance lights with this item. Working great after one year. Very well pleased.



by:

Nothing but RAVE reviews for eTrailer.com Parts were exactly as ordered, great price, fit perfectly. Couldn't be more elated with the fast service too!



by:

Great replacement light. These light are very similar to what was on the vehicle. The vehicle is a restored " Mobile Man Cave" / race support vehicle (1979 E-350 box van). I also needed a little assistance from Customer support and Cathy was very helpful. Fantastic experience all the way around. Thanks.



by:

Thanks again etrailer for a job well done. great clearance lights, fast delivery.
Third time ordering from etrailer and my experience as been perfect every time.



by:

I was fixing up a vintage Shasta trailer that needed new lights and your products were just what I needed. Thank you very much for the great service.



by:

As advertised and fast shipping. Thanks

Rick C. profile picture

Rick C.

7/30/2015

Great products at good prices.



by:

I want to keep the original look of my Airstream and the Double Bullseye lights are a perfect very cost effective replacement They add a nice new fresh look and keep the vintage appeal. I replaced all the yellow and red lights for a fresh look.



by:

Wanted to add a few lights and fix broken fender lights on my trailer. you had a great product with a great price with fast shipping couldn't be happier. Just orderd brakes from you and I wiil do buisness again with you.

Very satisfied customer, thanks,
Jim



by:

Easy to install! Really like the double lights



by:

Fast shipping, product was good. Easy mount. I am working on a gooseneck trailer trying to get it wired up. Still a work in progress, but these will help tremendously.

John N. profile picture

John N.

12/19/2017

The lights are working fine, no problems at all. Very pleased.



by:

Trailer Clearance Lights #MC42RB, easily installed, nice lights. There could be a little more space (maybe 1/8" in depth) on the backside so the wire could be positioned through an existing hole in the trailer and the light assy would sit completely flat against the trailer. Seems to be good value for the money and they are cheap.

Wayne B. profile picture

Wayne B.

3/13/2018

Still working great after a year, good value.



by:

No sense in totally converting to LED when these are availble...like the black base



by:

Great product but really was impressed with the customer service messages and quick shipment/delivery service...thank you!


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