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Gray Bracket and Single Wire Plug for Thin Line Series Trailer Clearance and Side Marker Lights

Gray Bracket and Single Wire Plug for Thin Line Series Trailer Clearance and Side Marker Lights

Item # A66PB
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Optronics Mounting Hardware Accessories and Parts - A66PB
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Optronics Accessories and Parts - A66PB

  • Trailer Lights
  • Mounting Hardware
  • Brackets
  • Optronics
  • Gray

Gray Bracket and Single Wire Plug for Thin-Line Series Trailer Clearance and Side Marker Lights

This kit combines a gray molded ABS, surface mount bracket and a molded plastic, single-wire plug for use with the MC65 Series lights. The bracket and plug unit measures 4-1/16" long x 1-1/16" wide x 1/2"D, with a molded lead wire attached. The light contains a single lead wire for power and is grounded through the mounting hardware.

  • Gray, all-weather, molded plastic bracket and wiring plug
  • Surface mounts MC65 Series lights
  • Mounts on 3" centers
  • Dimensions: 4-1/16" L x 1-1/16" W x 1/2" D
  • Wire gauge: 20
  • Single-wire design grounds through mounting hardware

Manufacturer Cross Reference
Bracket will work as an exact replacement for:
Uni Bond # BM1040B
Truck Lite # 19721
Grote # 43850

Manufacturer Specifications

Molded bracket and plug surface mount kit. Single-wire design grounds through mounting hardware. Includes bracket, plug and molded lead wire.

A66PB Gray Mounting Bracket and Single Wire Plug for MC65 Series Trailer Clearance and Side Marker Lights by Optronics, Inc.

Alternate part number: A-66PB

California residents: click here

Customer Reviews

Gray Bracket and Single Wire Plug for Thin Line Series Trailer Clearance and Side Marker Lights - A66PB

Average Customer Rating:  4.9 out of 5 stars   (23 Customer Reviews)


Easy installation.

Still working great after a year. Every once in a while I have to press the lights back into the mounts a bit but it isnt really an issue.
Bryan - 11/03/2021


In general, I am very pleased with the LED marker lights I ordered. One bit of advice, there is a "zero clearance" fit between the light itself and the mounting base. Therefore, the only screw that will work must be a tapered head which sits, fully recessed, within the mounting holes. The lights did not come with any mounting screws, so you must source your own.


I can say enough about item,it was easy to install and it made my enclosed car trailer look outstanding. I would highly recommend these replacement lights to anyone who would like to upgrade the look of their trailer.


Only issue was the plug on the end did not fit my FeatherLite trailer plug-in. It could have been a little sturdier.

Works good for 1998 featherlite trailer replacement. I spliced them in due to quick disconnect being wrong size.
Phil C - 03/27/2015


I have six of these amber leds on my boat trailer now, adding two red leds rear facing on fender. My Trailer has plenty of bling and everyone sees it coming and going... Etrailer service is always great, shipping prompt and pricing is the best I have found.


Simple install, retrofit to old boat trailer. Drilled two hole, fastened with rivets, installed lights and wired. Total job for both sides took less than 30 minutes. Used
MCL63AB Thin line LED lights. Very bright!!


Worked great on my 2008 and 2006 Feather-Lite trailers.

Working great, no issues
Phil S - 01/02/2018


Good replacement for Featherlite trailer. Could use a larger connector on the end but I was just using spices so I cut it off.


Single wire mount is the same as my featherlite trailer


I have not assembled the trailer yet, but the quality of the parts
is good, delivery was quick and the price was great due to the
free shipping. So far my favorite place to buy trailer parts.


I have been in trucking for sixteen years and these bases and light combination have held up the best in all weather conditions.These are my go to lights.


Great stuff. I just replaced old one on trailer today. It went smooth.


Very nice. Well built. Good quality. Would buy again. This company is awesome to deal with!


Great product, worked great!


Great light




by: 09/12/2022







See what our Experts say about this Optronics Accessories and Parts

  • Can Trailer Tail Light Mounting Bracket # A66PB Be Installed Upside Down
    Mounting bracket # A66PB can be oriented however you would like. There is no top or bottom. If, during installation, you determine that you need to flip it 180 degrees there should be no problem doing so.
    view full answer...
  • Can Gray Optronics Thin Line Bracket # A66PB Ground with 2 Wire Trailer
    The Gray Bracket # A66PB is designed to ground through it's hardware. If the metal on your trailer where you will mount this touches the trailer frame it would be fine to just run the power to the single wire of the bracket. Otherwise you can run your ground wire to the mounting stud of the bracket that has the gold colored strap ran to it on the side the light attaches to and you would be good that way as well.
    view full answer...
  • Ground Connection Keeps Coming Loose on a Featherlite Trailer with LED Lights
    I recommend using screws like you have done but also using a ring terminal to sandwich a wire going form the mounting location to some nearby steel. Having a ground wire attached like this should solve the problem. If running a wire is not feasible then I would still use screws but go ahead and use some blue Loctite, # LT37643, on the threads to keep them from loosening up. Ideally you will want a ground connection to bare steel. But it sounds like when the connection is tight the aluminum...
    view full answer...
  • Mounting Bracket Recommendation for a Optronics Thin Line Clearance Light
    There are three available brackets that will work with the Optronics Thin Line Series Clearance Light # MCL63CRB. There is a black one part # A65PB, a gray one part # A66PB and a chrome one part # A67CB. Check out the review video I attached for the # MCL63CRB.
    view full answer...
  • How To Install The Optronics Side Marker Light # MCL75AB And Optronics Chrome Bracket # A67CB
    The Optronics Sealed, Thin Line LED Trailer Clearance, Side Marker Light, part # MCL75AB, has the tabs on the end that will snap into the open slots on the ends of the Optronics Chrome Bracket and Single Wire Plug, part # A67CB. See the picture to the right that will show the light snapped into the mounting bracket. The chrome bracket has two mounting holes that are spaced 3 inches apart (industry standard). These holes are where two screws will go through and attach the bracket to the...
    view full answer...
    Image 1 for
  • Is A Mounting Bracket And Wiring Needed For The Optronics Trailer Light # MC65AB
    The Optronics Trailer Light, part # MC65AB, will need a mounting bracket and single wire plug like the Optronics Black Bracket and Single Wire Plug, part # A65PB. The trailer light will not mount directly to the trailer without a mounting bracket. The # MC65AB trailer light does not have any wiring. When this light is mounted to the # A65B mounting bracket it will ground through the mounting hardware and the single wire plug on the bracket will be used for the power lead. I also have...
    view full answer...
  • Installing Optronics LED Trailer Marker # MCL63AB on Trailer
    In order to install the Optronics Sealed Micro-Flex Thin Line LED Trailer Marker # MCL63AB on your trailer, you will need to add a bracket and wire harness, such as the Black Bracket with Single Wire # A65PB or the Gray Bracket and Single Wire Plug # A66PB. The choice between the two brackets is simply based on color preference, as they will wire and install the same way. The bracket will ground through its hardware, so it just needs a single wire to power the light. You will want to...
    view full answer...
  • Mounting Base and Wiring Harness for Optronics Clearance Light # MCL63CAB
    There are different bases you can use for clearance light # MCL63CAB. You can use base # A65B that you have referenced. For that particular base you would use wiring harness # A68P. We also have base # A65PB or # A66PB. With these you would use wiring harness # A65P with the single wire because the light will ground through the mounting studs of these bases.
    view full answer...

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Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Cole B
Installed by:
Cole B
Employee Jenny M
Updated by:
Jenny M
Employee Brian T
Updated by:
Brian T
Employee Noah M
Updated by:
Noah M

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