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Mounting Bracket for Optronics 90 Series or 91 Series Trailer Lights - Self-Grounding - Black
(108 reviews)
Price: $4.69
In Stock
Optronics
Mounting Bracket for Optronics 90 Series or 91 Series Trailer Lights - Self-Grounding - Black
Part Number: A91BB
In Stock
$4.69
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- All Info
- Reviews (108)
- Q & A (0)
- Photos
Optronics Accessories and Parts - A91BB
- Trailer Lights
- Mounting Hardware
- Brackets
- Optronics
- Black
Black plastic bracket lets you install an Optronics A91 Series, AL90 Series, AL91 Series, or AL191 Series trailer light. Surface mount on 2" centers. Light grounds through mounting hardware (sold separately).
Features:
- Mounting bracket for Optronics A91 Series, AL90 Series, AL91 Series, or AL191 Series trailer clearance/side marker lights
- Gasket creates a weathertight seal
- Self-grounding, surface-mount design
- Light grounds through mounting hardware (sold separately)
- Single-wire harness (A91LW) for light sold separately
- Black molded plastic construction
Specs:
- Dimensions: 2-7/8" long x 1-1/2" wide x 1/2" deep
- Mounting hole dimensions (center to center): 2"
- 3-Year warranty
Bracket is a direct replacement for:
- Uni Bond BM1020BC
- Wesbar 106289
- Truck Lite 15408
A91BB Optronics Black Plastic Base for A91, AL90, AL91, or AL191 Series Trailer Clearance/Side Marker Light
Alternate part number: A-91BB
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
- etrailer mistake
- Did not arrive in time
- Alternate product found
Ratings & Reviews
4.8
108 reviews
by:
Randy
03/25/2026
needed to cut the center section out to get my 2 male plug in. was mounting it on a plastic fender so the ground was mute. does what it is suposed to do with the light
by:
Randall D
02/21/2013
Bought the Optronics Sealed Trailer Light, UL95CB, as a replacement for my boat trailer's backup light and paired it with a Optronics Mounting Bracket, A91BB. The combo was a perfect replacement and fit. Installation was easy with stainless steel rivets. Etrailer.com had the best price BY FAR and the products were received prior to the estimated delivery date.
by:
Richard
08/01/2026
Great communication, and quickly shipped! Thank you!
by:
Mike
04/16/2015
Perfect replacement for my damaged mounting bracket. Great service and fast delivery.
by:
RPV
09/08/2016
The lights and brackets arrived nicely-packed, and worked on my boat trailer as intended as intended. Check the original mounting holes. The mounting holes for the new light bar were located in different positions, than the damaged light bar I replaced, so a drill and bits, and zinc spray paint might be necessary. I also used stainless steel screws, instead of the supplied screws.
by:
Roger B.
05/07/2015
I had to replace the two side marker lights on the tongue of my trailer. The originals were the same dimension as the tongue and if I had to step on the tongue to operate the winch my foot would either knock off the lenses or break them! The AL91AB lights were the answer being very slim, I could mount them below the top edge of the trailer tongue. Somewhere I read a review that implied if you had to remove one of the lights from these brackets, it was almost impossible. I did not find that to be true at all. Gently prying on one end with a medium flat screwdriver eased the light out with no problem. These brackets hold the lights securely and look great!
by:
Joel T
09/15/2014
I managed to smash a trailer clearance light on practically my maiden trip with a new boat and trailer. After thinking I could find one around somewhere (but never did), I went searching on the web. I found the exact items (light and mounting bracket) here, making replacement a snap.
by:
Marc
06/28/2018
I like shopping at etrailer for the vast variety of parts offered. I looked on Amazon first but they just didn't have the everything I needed in one place. etrailer did! Transaction was easy, shipping was fast, parts work as advertised, and prices are fair. What more can you ask for!!
This particular part was an exact fit on my trailer. Works great, nice and bright! A big upgrade from the part I had in there previously.
This particular part was an exact fit on my trailer. Works great, nice and bright! A big upgrade from the part I had in there previously.
by:
no name
02/25/2013
I did have to drill new holes for the mounting bracket, but after that the installation was easy. Inserting the sealed LED clearance light was a bit of a tight squeeze, but I guess a snug fit is needed.
I would recommend the bracket and LED light to anyone.
I would recommend the bracket and LED light to anyone.
by:
Carl
08/24/2016
I recently purchased red reflective lights for my boat trailer. Price, service and fast delivery time are outstanding. There is no need to waste time, money and energy trying to find items locally. Just let your fingers do the walking on-line to buy quality products at a reasonable price. Carl Milligan - Kinston, NC
by:
Casey
08/23/2019
I've ordered everything from wheels and tires, to lights for my trailer. Customer service is always quick to answer any questions, or to help you get the right items for your needs.
Prices are always great as well.
Prices are always great as well.
by:
Jim G
06/03/2017
Dear etrailer,
It has been a pleasure dealing with both Lisa and your company. I got a fantastic deal plus free shipping. You are my go to guys for trailer supplies.
Thanks
It has been a pleasure dealing with both Lisa and your company. I got a fantastic deal plus free shipping. You are my go to guys for trailer supplies.
Thanks
by:
Mauricio
06/29/2023
I love these mounting brackets. They make the installation of and maintenance of my trailer lights so easy.
by:
Darrell
11/07/2017
Perfect fit!!!! I will add another to my next order to have as a spare.
Darrell
11/7/2018
It’s been a year now and this product is still going strong. I am very happy with this purchase.
by:
Brad
08/08/2021
This is my third order from Etrailer……quick response to my questions, video descriptions of the products, fast shipping, got exactly what I ordered…..I wish all companies would take pride in their businesses like Etrailer does!
Thank you, Brad
Thank you, Brad
by:
Mark F
04/22/2014
I replaced two of my existing AL91 series marker lights after a blowout wiped out the fender and both lights. These lights work great and since they are sealed, they work even though submersed in fresh water numerous times.
Wouldn't hesitate to buy them again should I have another blow out. God forbid!
Wouldn't hesitate to buy them again should I have another blow out. God forbid!
by:
Danny D
03/17/2015
Product worked perfect for exact replacement of broken ones on my boat trailer, fast shipping thanks etrailer
by:
Eric
02/14/2022
etrailer is my go place for trailer lighting. I am quite fussy about my stuff and who I purchase from. These guys have everything you need at a fair price. Look nowhere else, and they ship fast.
by:
Jerry
03/02/2018
The light base is well made and fits perfectly.
Jerry
3/2/2019
Still great after a year.
by:
Thomas
03/02/2025
Exactly what I needed, new replacement for old and worn lights
by:
roy quinn
10/24/2014
I received my replacement promptly and the sales person took extra pains to help reduce the shipping cost on a small and inexpensive item. They seem to have excellent employees, and very courteous.
by:
Bill l.
02/01/2017
Mounting bracket keeps the light assembly secure on my trailer fendets. Nice value and nice price.
by:
Cale
10/24/2024
Perfect parts for perfect trailer lighting. Nice products, e-trailer!
by:
Michael
09/01/2022
Great products , quick delivery , have ordered and installed electric brakes for my boat trailer they are perfect
by:
Bill
03/18/2018
good little light the grommet fit too (my ezloader trailer)
good service, got her in a few days.
good service, got her in a few days.
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See what our Experts say about this Optronics Accessories and Parts
- Single Plug and Wire for Thinline LED Clearance and Side Marker LightHey Eric! The single wire for the Thinline LED Clearance and Side Marker Light # AL91RB is the # A91LW. If you need the self-grounding mounting bracket it is # A91BB for black or # A91CB for chrome. Don't hesitate to reply below if you need anything else.
view full answer... - Do Thinline LED Clearance and Side Marker Lights Come With Bracket and WiringHey Mike! We don't have an all-in-one part that comes with the brackets and pigtail so you need to order those parts separately. The # AL91RB and # AL91AB will work with the Mounting Bracket # A91BB and then for a pigtail you can use the Right Angle 2-Wire Pigtail # A46PB. Where are you headed with your boat once you get the lights replaced on your trailer?
view full answer... - Replacement LED Taillight Recommendation for 2002 Shoreland'r Profile 2000 Boat TrailerWe do indeed have some LED taillights that'd work great on your boat trailer. I'd recommend # STL57RB for the driver side and # STL56RB for the passenger side. These lamps measure 6-1/16 x 2-5/8 inches, and would work well on your trailer. As you can see in the photo provided by one of our customers, the taillight works well on a Shoreland'r trailer. As long as they're still working okay, you certainly may leave the existing fender running lights in place. If you decide you want to replace...
view full answer...
- Replacement Amber Clearance Light for a Peterson PM 150 Sealed lights would have to be replaced since there is not easy way to get them open and maintain functionality of the light. Your light looks similar to # A91AB. This light measures 2-1/2 inches across, 1-3/16 inches tall and 7/8 inches deep. It mounts in base # A91BB and can use harness # A91LW.
view full answer...
- Replacement Boat Trailer Clearance Light with SAE P2 91 DOT on the LensThe number on the lens that you see is the lens rating, not a part number so it is difficult to go by that number. There might be a part number on the back of the light housing. Otherwise it would be easiest to go by the dimensions of the light. For example light # A91RB does have the same lens rating. It would use a base such as # A91BB and wiring harness # A91LW for the power wire.
view full answer... - Replacement Amber Mini Trailer Clearance Light For Wesbar 3395 We have just what you are looking for. The replacement clearance light we offer is the Optronics Mini Rectangular Clearance Light, part # A91AB. This is an amber light that measures 2-1/2 inches long x 1-3/16 inches wide x 7/8 inch deep. This light requires the # A91LW pigtail to complete the wiring and a mounting bracket. The bracket is available in black, part # A91BB. For a chrome finish, use # A91CB.
view full answer... - Are All LED Lights Submersible For Use On Boat TrailerWhen selecting an LED light, if the description states it is waterproof or submersible then the light can be submersed in water. The item you selected, Waterproof, Under 80 Inch LED Trailer Light Kit with 25 Foot Wiring Harness, part # TLL9RK, has encased LED diodes. Water can enter the light lens but not the LED casing. There are also 2 holes that allow water to drain out of the lens. Part # TLL9RK are used for the rear trailer lights for running, turn, and brake lights. For sealed...
view full answer...
- Is there a Grommet for Peterson Clearance Light # M152AFor a rubber grommet that will fit the Peterson clearance light # M152A you can use # A91GB. If you are looking for the plastic base we do not carry that particular model and in that case I recommend switching to light # A91AB and using bracket # A91BB with power wire # A91LW (the light grounds through one of the mounting screws with this light and bracket combination).
view full answer... - Replacement Tailgate Marker Lights for 1984 GMC C-Series Dually PickupYes, from what I found, you can use # AL91RB LED lights to replace the five original incandescent tailgate lights on your 1984 GMC C-Series Dually Pickup. These are standard size clearance lights (2-1/2 x 1-3/16) that were used on a variety of different trailer and some truck OEM applications and were sold under a number of brand names. Keep in mind that these lights don't have wires coming out the back, so in order to install them you'll also need a mounting bracket # A91BB to provide...
view full answer...
- Does Optronics Mini Thin Line LED Marker/Clearance Light # AL191AB Use Grommet # A91GBYes, the Optronics Mini Thin Line LED Marker/Clearance Light # AL191AB can be flush-mounted using the Optronics Flush Mount Grommet # A91GB. This PVC grommet will provide a degree of shock protection for the installed light and its rear opening allows easy access for wiring. If you prefer a surface-mount installation, you can instead use self-grounding mounting bracket # A91BB. The marker light # AL191AB has a 2-prong input on the back; you can use 6-inch pigtail plug # A46PB, or if you...
view full answer... - Grommet Recommendation for the LED Waterproof Grommet Mount Clearance Side Marker Light # 47-203667The recommended grommet for the # 47-203667 and # 47-203668 that you referenced is the part # 221588. Without knowing exactly what you have on your trailer it's hard to say why the lights you have won't fit it. Unless you can come up with a way to modify the grommet you have now the only recommendation I can make would be the part # 221588.
view full answer... - Will LED Clearance Light Work With One WireYes, the Thinline LED Clearance and Side Marker Light - Submersible # AL91AB will work with your single power wire, as it uses a 2-wire (one for power, one for ground) pigtail or 1-wire pigtail with a self-grounding bracket. To mount this light you have a couple options. The first is the Mounting Bracket # A91BOB with Right Angle 2-Wire Pigtail # A46PB; you'd also want to use the Self-Tapping Screw # 1131832. Your other option to mount this light is to use Self-Grounding Mounting Bracket...
view full answer...
- How Does the Red Side Marker Trailer Light # AL91RB Install and what Parts are Needed to InstallFor the clearance light # AL91RB and the matching amber light you would install the lights in the appropriate bases like # A91BB and then use 2-wire pigtail # A46PB, plug it into the backs of the lights and attach the wires to the existing trailer wiring. The ground wire can be attached directly to the trailer frame. I have included a link to a video review of the clearance light for you.
view full answer... - Is Female Plug Available For Single Wire Male Plug For A91 And AL91 Series Trailer LightsThe single wire plug # A91LW is designed to plug into a light that has the female plug already installed on the back of the trailer light. The # A91LW has a 12 inch lead wire with the male plug attached. Many of the Series 91 lights have two female plugs which would use the standard 2-prong wire like part # A46PB. If you use a self-grounding bracket like part # A91BB for a series 90 or 91 trailer light, the single wire # A91LW can be used.
view full answer...
- What is the Depth of Optronics 2-Wire Pigtail?I believe what you are asking is the depth of 2-Wire Pigtail # A46PB, and it is 0.6 inches, which is just 0.1 inches more than the depth of both mounting brackets you were referring to, # A91BOB as well as the self-grounding # A91BB. This means it would protrude ever so slightly from the back of the bracket when attached to lights # AL90RB and # AL90AB.
view full answer... - Looking for LED Version of # AL91RB Mini Rectangular Clearance/Side Marker LampYou bet we do! For the LED version, you'll need part # AL91RB. The lamp can be grommet mounted using # A91GB or surface mounted using a self grounding base like # A91BB for black/ # A91CB for chrome or a standard base like part # A91BOB for black/ # A91OB for chrome. If you use a self grounding base, use the single wire pigtail, part # A91LW or for the standard base, use the two wire pigtail, part # A49PB.
view full answer... - Clearance Light Base Recommendation for the Clearance Light part # A91ABIt sounds like you need the Black Mounting Bracket # A91BB. This is the black base for the Rectangular Trailer Clearance and Side Marker Light # A91AB that you referenced. Check out the review videos I attached for these products also.
view full answer... - How to Wire up the Thinline LED Clearance and Side Marker Light to Single Wire TrailerTo use the # AL91RB on a trailer that has one wire for the power wire and then grounds through the mounting bracket would only require the bracket part # A91BB for the bracket and then part # A91LW for a single wire connector.
view full answer... - Are Mounting Brackets Needed To Install Optronics LED Trailer Clearance Lights # AL91RBFor installation of the Optronics LED Trailer Clearance Lights, part # AL91RB, you will need to use an Optronics Mounting Bracket. You can use either the Optronics Black Mounting Bracket, part # A91BB, or the Chrome Mounting Bracket, part # A91CB. The brackets are sold individually, so you will just need to order the same quantity as the number of lights you have. I have linked a video that show the installation of the Optronics AL91 Series Lights.
view full answer... - Troubleshooting LED Single Wire Clearance LightsThe reason your single wire LEDs aren't working is because you aren't using a ground. Most single wire lights like the Amber Clearance Light with Stainless Steel Hardware # 47-99-006 will have a separate ground like in the mounting hardware. The Thinline LED Clearance and Side Marker Light # AL91RB you asked from will ground through the mounting bracket # A91BB. The mounting with butyl tape is the issue. You need to have a ground connection for your clearance lights to work.
view full answer... - Wiring Pigtail and Mounting Bracket Options For Installing Thinline LED Clearance And Marker LightsThe Thinline LED Clearance and Side Marker Light # AL91AB require certain mounting brackets and plugs that are either already installed on the trailer or are available separately. A Right Angle 2-Wire Pigtail # A46PB will work with the Grommet # A91GB if you are looking to recess the light. Or Mount Brackets # A91OB and # A91BOB if you want to mount them on a surface with the wiring running behind the bracket. The Plug - Single Wire # A91LW is used for Mounting Brackets # A91BB and...
view full answer... - How Does Optronics Clearance Light MCL-91AK Wire to Two Wire TrailerYou'd wire the # MCL-91AK by using the bracket the part # A91BB and the single wire part # A91LW. You'd run the power for the light to the single wire and then run the ground wire you have to the mounting hardware of the bracket as it is designed to ground through it.
view full answer... - Black Mounting Bracket for A91 Series Trailer Clearance Lights # A91BB RecommendationThe Sealed, Mini Rectangular Trailer Clearance and Side Marker Light, part # A91RB, that you have are self grounding. You would need a Black Mounting Bracket for A91 and AL91 Series Trailer Clearance, Side Marker Lights -Self Grounding, part # A91BB, for them to ground and function correctly. Your other option would be to run a ground wire and power wire to the two terminals of the # A91RB. However, it would probably be easier to just get the # A91BB.
view full answer... - How to Mounting the Mounting Bracket for A91 and AL91 Series Trailer LightsI would recommend using stainless steel sheet metal screws for mounting the Mounting Bracket for A91 and AL91 Series Trailer Clearance, Side Marker Lights, since the connection to the trailer needs to make a good ground connection.
view full answer...
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Mike
4/21/2016
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