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Submersible, Under 80" Trailer Light Kit with 25' Wiring Harness

Submersible, Under 80" Trailer Light Kit with 25' Wiring Harness

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Optronics Tail Lights - TL5RK
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Trailer kit with 2 stud-mount, submersible tail lights; corrosion-resistant license-plate bracket; 2 amber side marker and clearance lights; 25' wiring harness with 4-pole connector; mounting hardware Lowest Prices for the best trailer lights from Optronics. Submersible, Under 80" Trailer Light Kit with 25' Wiring Harness part number TL5RK can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (215)
  • Q & A (70)
  • Videos (2)
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  • Why etrailer?

Optronics Trailer Lights

  • Tail Lights
  • Square
  • Kit
  • Incandescent Light
  • Red and Amber
  • Surface Mount
  • 5L x 4-1/2W Inch
  • Submersible Lights
  • Optronics
  • Stop/Turn/Tail
  • Side Marker
  • Side Reflector
  • Rear Reflector
  • License Plate

Trailer kit with 2 stud-mount, submersible tail lights; corrosion-resistant license-plate bracket; 2 amber side marker and clearance lights; 25' wiring harness with 4-pole connector; mounting hardware


Features:

  • Red, submersible, trailer light kit with stud mount lights, license bracket, amber clearance lights, wiring harness, mounting hardware
    • 2 Red, stud-mount, submersible tail lights (ST6RB and ST7RB)
      • Driver's-side light includes license illuminator
    • Corrosion-resistant license-plate bracket
    • 2 Amber, stud mount, square side marker and clearance lights (MC36AB)
      • Self-grounding through mounting stud
      • Lights include reflectorized lenses, eliminating the need for separate reflectors to meet DOT requirements
    • 25' Wiring harness with 4-pole connector
    • Mounting hardware included
    • DOT approved
  • Limited 3-year warranty - excludes bulbs

Note: Lights included in this kit pull 2.5 amps for stop/turn function and 1 amp for tail signal. Please check the amperage capacity of your vehicle wiring harness to ensure this light kit will not overload your wiring harness.


  • Packaged kit includes 2 submersible, stud-mount tail lights, 2 amber side markers and a corrosion-proof license-plate bracket
  • Contents: (1) ST6RB, (1) ST7RB, (2) MC36AB and (1) license-plate bracket
  • Equipped with a 25' wire harness and mounting hardware


TL5RK Optronics Submersible, Under 80" Trailer Light Kit with 25' Wiring Harness, Stud Mount

Alternate part number: TL-5RK

Item # TL5RK





Video of Submersible, Under 80" Trailer Light Kit with 25' Wiring Harness

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Optronics Submersible Trailer Light Kit Installation

Today we're gonna take a look at, and show you how to install the Optronics Submersible Under 80" Trailer Light Kit with 25-foot Wiring Harness. Part number is TL5RK. Now, this trailer re-wiring kit is really gonna give you all the lights you need to make sure your trailer's within compliance with all the laws and regulation. This light happens to be on the driver side, has our license plate illumination panel there on the bottom. Got our side lights and our stop, turn, and brake lights here on the back. The passenger side light's gonna be identical to this one, it's just not gonna have that open panel at the bottom, or that clear lens at the bottom to illuminate your license plate.Now, if you're using marine applications, these are gonna be an excellent choice as well.

These are submersible lights, that means they are protected inside with a small cover. And there's also a hole here at the bottom to allow any moisture out that might be trapped inside the housing. One thing you definitely wanna do though, it's highly recommended to unplug the lights from the back of your vehicle as you're backing into the water. You don't wanna get water in here in this bulb, if it's really hot you could run risk of damaging it. Here you can see our side maker light has the single stud attachment point, which grounds right through the light.

So you just have one wire that's gonna get connected right to the running light wire from our y-harness. You'll notice that the lens is also reflectorized, so as it's sitting out somewhere dark when headlights hit it, it's gonna shine and be visible.Now, this kit features incandescent lights, which are gonna be our standard glass-fold kind of lights. They're gonna do a good job of matching what was originally on the trailer. If you are going through a complete rewire on your trailer, if you're trying to update a trailer, a lot of the newer LED lights are also a good choice. So, that's something to consider.

They tend to last longer, you're not gonna have to worry about bulb replacements nearly as much. They don't draw as much power through our vehicle. And they tend to give kind of a clearer, brighter light. So, definitely, something to keep in mind if you're going through the work of changing over an entire trailer, might be a good option to pick as well. Now, you can see the 4-pole connector, unlike a lot of the other ones, is encased.

So, as you make your connection with your vehicle it's gonna offer a little bit more protection for us.Now, to begin our install, we wanna choose the appropriate side of the plug. In your kit you're gonna get both the truck side and the trailer side. The trailer side's gonna be the more squared one, where this ones gonna have our three-leads and our bigger ground. Now, most vehicles are gonna be equipped with a 4-pole plug on them already. If you're using this trailer or this wiring kit for a trailer that's going to be connected to a car that doesn't already have a wiring kit, check our website and look for something custom fit for your application, so you know it's gonna work. With this lead, you're basically gonna be tapping into, directly to your brake lights, tail lights, and it's just not protected that way. So, it's a good idea to get something custom fit. If you just need a replacement, this is a really good idea. You can just replace the 4-pole coming out of your vehicle with this one by matching up the wire color.Now, we've stripped our trailer down, removed all of the old lights. We're gonna be replacing everything all the way back. The only thing we haven't stripped out yet is our old wiring. As long as it's intact, we can use this and pull our new wiring through. So, make a couple loops here on the end. This is the right side of the trailer if we're looking at it from the back. On this side, your green and brown wire is the one you'll wanna run back. The left side of the trailer, looking at it from the back, is going to be your yellow and brown wire. Just gonna bend these over, I'm gonna attach them to the old wires, tape them off and use those to kind of guide it through. Electrical tape's generally what we use here, just to hold these together. Now, you see, kind of what we're gonna do, we'll pull on our old wire and it's gonna bring our new wire through.Now, one thing you wanna keep in mind as you're routing your wires is to leave enough length to easily be able to connect to the back of your vehicle. I'm gonna bring it out just a little bit further than what this ground is gonna allow. So, we'll extend that later when we connect it. Now, once we get to the first light position, we wanna get it installed. Our first one's gonna be our side marker light. It's gonna have a nut and a lock washer on it. You wanna remove that. But pretty often, you can have a situation like this. You can see this is an elongated hole, we don't wanna use a lock washer behind that because it's probably gonna catch on that and it'll wind up opening that lock washer. So, we're gonna place our light through. Now, we're gonna use a flat washer, that'll allow that lock washer something to bite on. Also, you'll see here on the bottom of the light, there's gonna be a little gap there for your wire to pass through.So make sure you have it passed through there. Once we have that through, put our fender-washer on, our flat washer, then our lock washer, and our nut. Then we'll use a 10-millimeter socket and we'll wanna tighten that down. All right. Now, we need to splice this into our running light signal, that's gonna be our brown wire. Right here. So, we wanna separate the two of those. Now, to get that separated, you generally use like a little flat blade, but the key is here, you wanna go between the two wires. You don't wanna go into the insulation on the wires. So, keep that in mind. Once we're through there, I'm just gonna pull those apart. Now, for making your connection here, they supply you with a quick connector. Basically with this, what you're gonna do is place this upon your wire, just like that. You're gonna place this one in the other side, and when you push down that tab, that's gonna make a connection between your two wires.The tab comes down and in like that. Then you've got this cap that comes over the top. Now, generally, if we have a failure in a trailer it's in this area. So, we do away with these. I'm gonna show you a good solution. This is a heat shrink butt-connector. So, in using that, we're going to splice our wire. Gonna make a cut here. I'm gonna strip back both sides on our light wire, like that. Doesn't really matter what side you do. We're going to twist our light wire together with our running light signal wire. Place on our butt-connector and then get that crimped down. I'm gonna pull on that to make sure you've got a good connection made. Take our other side, place it in and we'll crimp that down. Now, I need to use a heat source to get that shrank. You can use a mini torch. You can use a heat gun. Generally, I just use a lighter. The key is, just to heat it up a little bit at a time.It's gonna turn clear. It starts to shrink down. And then when it gets all the way shrank, it's gonna look like that wire gets a little bit bigger. There'll be a little clear gel that comes out of the end. Once you get that little bit of clear gel, wire looks like it's magnified. So that side shrank down, we'll do the same thing here. Now, by using one of the heat shrink butt-connectors like this, you're going to eliminate any issues you're gonna have with corrosion's at your connections. Generally, this is just gonna make your wiring job last a lot longer. Gonna pull that up, and we can continue on down our trailer. Now, another common problem that we run into on rewiring trailers, our old wiring ran right through this tube. It's really nice, keeps it up and out of the way. But this is almost turned to concrete in there. We weren't able to get that wire out, so we're clearly not gonna be able to get our wire back through.One way around that's gonna be with a loom-clamp. And of course, every trailer's different, so you wanna pick which application's gonna work for you. But, this is part number A0250. We have them readily available on our website. What we're able to do with this, just put our wire in, and I'm gonna tuck that right down there. So, it'll keep it out of the way, we won't have to worry about it hanging up on any of the equipment we're loading up or anything like that. And to attach it, we're gonna use a self-tapping screw. Once we've marked and started our hole, get it attached just like that. And another thing I like to do with these connections is put a zip tie right on the front side and then also right on the back side of this. And basically, that's gonna keep our wire from moving forward and back. The loom-clamp does a fairly good job of grabbing it, and I think if we do that, then we don't have to worry about that wire going anywhere.Okay, we're gonna follow this same procedure basically back to our next light. We're gonna get this tucked up and out of the way to keep it protected back to our next connection point. Now, we're adding a couple of the side-marker light we used up front as a fender clearance light as well, here. This is part number MC36AB. And, just gonna be placing it on using the provided hardware, no need for a flat washer here, 'cause it's just a circular hole. Then we're gonna splice this one in just like we did the one up front there. Now, with our wire here at the back of our trailer, we're gonna get our light attached. The green wire light's the one we wanna use here on the passenger side. On the back, you can see it's got a flat washer and a nut. I'm gonna take both of those off. And we'll place that in the bracket on our trailer, and we're gonna place a flat washer back on each of those and use that nut to attach it. You'll wanna use a 7/16" wrench for these nuts. I'm gonna get it secured down.Now, you should have a little bit of excess wire here. So, we'll wanna get that trimmed off. Let's see, I'm gonna put that right there. I'm also gonna take a little bit of the wire off my light. We're gonna strip back both sides. Now, in the kit you're gonna have little wire nuts, once we have the two browns twisted together then this just kinda threads on like a nut. Now, as you can see, that leaves a pocket for moisture and dirt to get in there and eventually lead to corrosion. So, just like we did on our other lights, we're gonna switch our connectors out to heat shrink butt-connectors. Just gonna twist them up, slide them on and get them crimped. Now, we'll be attaching the green wire to the green wire, and the brown wire to the brown. Now, we'll get those shrank.Now, once we have everything in place here and secured down. We're ready to go to the other side of the trailer and just do the exact same thing. Whatever works for your application. Now, when mounting your left side light or the driver side light, you wanna ensure that you put your license plate bracket on there. If you'll look on the bottom of the housing, you're gonna see we've got our light right here, that'll illuminate the plate for us. I think our situation is gonna be better to have it just like this, so our plate will hang there and it'll get plenty of light. That bracket's gonna get sandwiched right in between the back of the light housing and our mounting bracket. And just like the other side, we're gonna put on our flat washers and our nuts. Now, depending on your trailers set up, you may need to run a jumper wire to get to any lights that you have on the back.We're gonna take the little bit of extra brown wire that we've got out of our kit, and we're gonna splice it in together. Just like we did our other light. So, two wires going into one side, one wire going into the other. And that's gonna give us this lead that we can run back for anything else we might need. All right. Here you can see our taillight connection, yellow to yellow. Our running light connection, brown to brown. Then we've got our jumper there. So, we'll shrink them down, get it anchored out and we'll be in good shape. Now, we've added on just a little bit of extra wire to our pigtail here, use that same heat shrink butt-connector we've used for all of our other splices. Then we're gonna add a small ring terminal on to the opposite end of that. Now, we'll just make our attachment. Just like that.Now, at this point, our wiring's ready for use. Something I do like to do though, I like to start with some electrical tape here. Just kinda go all the way back. So, we've got just kind of a single wire here at the front, rather than five different ones. Now, to test out our installation, we're gonna use either a trailer tester, or you can simply plug it into your towing vehicle. We'll turn on our running light, we'll wanna check and make sure those are all working. We're gonna do our left turn signal. We're gonna do our brake lights and our right turn signal. Now, we're just gonna use our old hardware and we're gonna reattach our license plate here. Get those snug down in a minute. You can see how that light's gonna project down on there and keep you legal.And that's gonna complete our look at the Optronics Submersible Under 80" Trailer Light Kit. Part number TL5RK.


Customer Reviews

Submersible, Under 80" Trailer Light Kit with 25' Wiring Harness - TL5RK

Average Customer Rating:  4.7 out of 5 stars   (215 Customer Reviews)

Trailer kit with 2 stud-mount, submersible tail lights; corrosion-resistant license-plate bracket; 2 amber side marker and clearance lights; 25' wiring harness with 4-pole connector; mounting hardware

- TL5RK
by:

The lighting system performed well in traveling from NY to northern Michigan and return to carry an old boat back for restoration. 435552



- TL5RK
by:

Exactly what was described, nice price, works properly. I opted to solder wiring and use shrink wrap instead of splicing supplies it came with. 642214



- TL5RK
by:

I love the Item I purchased, very easy to install and got it a very good price. Two years or so ago I bought a front mount trailer hitchfrom E-trailer and got the best price and free shipping which was incrdible. I will always buy my trailer/hitch needs from etrailer.com. In fact I'm a retired NYC correction officer and attend union meetings as a retiree and will at the next meeting recommend etrailer.com to everyone there.. thanks for being a reliable company with the best prices on the net or anywhere else for that matter.. Nick Costantini 35437



- TL5RK
by:

Product is great works awesome. Took me just a little while to research that GROUNDING is the key to making everything work :) But, figured it out and better for the knowledge I gained. Would be helpful if you included with this product a good overview of grounding for people to make sure they understand the relationship of all light fixtures making contact with frame of trailer :) Very happy with purchase :) 214739



- TL5RK
by:

While there was more here than I needed (the trailer was already wired, it just had broken lights), getting this package was the cheapest and best way to get what I needed...exact, drop in replacements. Shipping was quick...your service is outstanding. That is why I will be getting another package today (which I ordered the day after I ordered the lights), and is the reason I keep going back to etrailer.com. Great prices, great service and if you ever have to talk with anyone they are the nicest people in the world. Thanks! 80337



- TL5RK
by:

Helen is the BEST!! She understood my problem and help correct it by ordering a different wiring kit, yes I did receive it and wish I would have had this in the first place. I will be returning the other one today. 543044



- TL5RK
by:

Exceptional quality for the price! I made the mistake of purchasing a kit at one third the price if this one, (I literally got what I paid for)! But no worries, as this kit was a vast improvement over the cheapy Chinese trailer light kit. I would have given it a five star, however the plugs finish quality were less than they should have been, (mold flashing, and an odd shape) they should check to make sure that the plugs are GM, Ford and Chrysler compatible. I went to the auto parts store, (NAPA) and purchased a Ford compatible male/female plugs to splice into the wire harness, versus the plugs that came with the harness provided. 303027



- TL5RK
by:

Excellent product - very easy to install and directions were great; but even better etrailer communications, very reasonable and extremely fast shipping. A+ 132071


Comments
Still working like a champ! A continues a year later...
NautiBuoys - 05/23/2015

11995

- TL5RK
by:

Used these on a brand new trailer with a separate ground ran to each light from the white ground wire off the harness. Nothing but problems, the bulbs if put in wrong will mess up everything. Ended up buying blazer led lights from tractor supply and worked great. I would not reccomend these. 294723



- TL5RK
by:

Product was Great. Service was even better. Thanks jeff l 739480



- TL5RK
by:

I definitely recommend this website for anyone who needs great pricing, fast delivery and quality products, plus I was able to watch videos and review great photos for all items I was purchasing. i will be using the website for all of my future trailer needs 734872



- TL5RK
by:

Came with everything that I needed for a good price 728624



- TL5RK
by:

EXcellant communications and service , if you need trailer parts this is the place to go !! 725274



- TL5RK
by:

New and exact replacement for the old ones I had. Just needed one light, but since I have the whole kit, I'm replacing everything new. Fast shipping and product is of good quality. 713383



- TL5RK
by:

Easy install Same bolt up hardware as the prior light set We had the trailer back on the road the day I received the new light set. 707284



- TL5RK
by:

Great service. Great product, exactly what wanted. 705187



- TL5RK
by:

The Submersible, Under 80" Trailer Light Kit with 25' Wiring Harness kit that I purchased worked well for my application. I had an old, broken set of lights on my trailer. I found this kit from Optronics on etrailer and after reviewing the pictures, diagrams and information listed on your website, I knew this would be a great replacement for the OEM lights that came on the trailer. I received the kit in the time listed for my shipping selection and once I got the kit, I was able to install all of the lights and wires with ease. This is a great kit from Optronics and had all of the components I needed to make sure anyone behind me knows when I am stopping and turning. Thank you employees of etrailer for helping me get the product that I needed. 700213



- TL5RK
by:

Out with the old and in with the New.... 698929



- TL5RK
by:

Items were as advertised. Quality products, reasonable prices, fast shipping, and great customer service are all reason why I will be shopping here again when the need arises. 699136



- TL5RK
by:

Ordered this light kit from etrailer and paid a little more than buying a generic set from [online retailer] thinking, like other products I have purchased here, the lights would be a better quality. Instead they arrived with very light wire, appears to be 18 gauge and average quality "submersible" lights. The cheaper lights on [online retailer] came with 16 gauge wire and looked at least if not more waterproof. 688347


Comments
I confirmed with Optronics that the pigtail wires on the lights in this kit have 20 gauge wire. These lights are designed to be submersible and feature a drain hole on the bottom too allow any water to escape, they are not waterproof.
-- Victoria B - 08/21/2019

60215

- TL5RK
by:

Great quality product. Does not appear to be one of those cheap brands that the local auto shops carry. 681863



- TL5RK
by:

Great product 673073



- TL5RK
by:

High visibility and easy to install...and replace lens. Like all of us, keep spare lens close by...you know why. 672305



- TL5RK
by:

Bought this for my boat trailer. It’s in the water on the launch ramp twice a week spring summer and fall. That said, I generally try to unplug the lights before I submerge them. I’ve forgotten that step once or twice with no issues. Price was right. Easy to order. Shipped quickly. Easy to install. Still working as expected a year later. It doesn’t get better than that! 670613



- TL5RK
by:

Parts look great- will be a few weeks before installed. 668540


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Ask the Experts about this Optronics Trailer Lights

  • Square Trailer Tail Lights Compatibility with Metal Light Guard for 440 Style Lights
    The Optronics Submersible, Under 80" Trailer Light Kit with 25' Wiring Harness # TL5RK will work seamlessly with the Light Guard - Unpainted Steel for 440 Tail Light # LG440NP you referenced. This guard is specifically made for these style lights so the dimensions will fit them just like the pictures on the product page. I've also attached a photo of the similar LED lights # TLL9RK in the same size for reference.
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  • How to the Lights in Trailer Light Kit TL5RK Ground to the Trailer
    The lights included with light kit # TL5RK ground through the mounting studs. The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the light grounds to the main trailer connector ground can help. It does sound like a weak ground connection....
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  • Available Complete Trailer Light Kits
    We offer all sorts of both incandescent and LED trailer light kits and parts but none of these is intended to work directly with a vehicle's OEM light wiring or bulb fixtures. You'd need OEM light fixtures (that accept your wiring and bulbs) and a way to mount them on your new wood deck in order to keep your existing wiring in place. I'm afraid we don't offer OEM vehicle parts like that. What might be a better option for you is to select a complete trailer lighting kit like those shown...
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  • Need Tail Light Mounting Brackets for Tail Lights Included in Trailer Light Kit # TL5RK
    The Optronics Trailer Light Kit # TL5RK that you referenced does not include mounting brackets for the two tail light assemblies since these lights use their mounting studs to mount and provide the ground connection. You can use a bracket to mount the tail lights but you will want to be sure that there is a solid metal-to-metal connection between the bracket you use and the trailer frame to enable a good ground. The spacing of the two mounting studs on these Optronics lights is 2-inches...
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  • What is the Wire Gauge on the 4-Way Wiring Harness for Optronics Trailer Light Kit # TL5RK
    I measured the wire gauge on the Optronics light kit # TL5RK and the wires are 18 gauge. This is measured on just the copper strands with the insulation stripped off.
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  • Connecting Trailer Side Marker Lights to Trailer Wiring Harness
    The marker lights would tie into the running light circuit, which is carried by the brown wire on the trailer wiring harness. I've linked you to a trailer wiring diagram, and also to our trailer wiring FAQ article.
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  • Troubleshooting New Trailer Wiring Where Running Light Circuits arent Active
    Either the lights don't have power like they should or it's a ground problem. Most likely it's ground related though as that's what causes most trailer wiring issues. What I would do is try grounding the assemblies to the frame of the trailer and then also keep the ground wire that runs to the main harness you have as well. Between those two ground circuits you should get the lights to work. You can also use a circuit tester like part # PTW2993 to check to make sure there is power ran to...
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  • Submersible Trailer Wiring Kit Recommendation for Redoing Lighting on a Boat Trailer
    A very popular trailer lighting kit we offer for boat trailer is the Optronics kit part # TL5RK which comes with two taillights and clearance lights that are submersible. The lens allows water to pass in and out of it but the actual light assemblies inside of it are sealed. It also comes with a license plate bracket and new wiring. The lights included are incandescent. If instead you wanted an LED solution the part # TLL36RK would be what you would want. LEDs are brighter, last much...
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  • Trailer Lights Not Lighting Up Properly on Harbor Freight Trailer
    It sounds like the wiring harness you have is what is called a wishbone harness. These will have 2 wires that connect to the single running light pin so you don't have to run a jumper wire from one side of the trailer to the other. It also sounds like you have everything hooked up correctly. Yellow is usually left turn and brake lights, green is usually right turn and brake lights, brown is usually running lights, and white is the ground. You can test this by connecting the trailer...
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  • Instructions for Wiring Additional License Plate Light With Submersible Trailer Light Kit # TL5RK
    When it comes to adding an additional license plate light to the Submersible, Under 80" Trailer Light Kit with 25' Wiring Harness, # TL5RK, I recommend taking a look at the LED Mini Trailer License Plate Light, # LPL31CB. The light has a weathertight seal to protect it against the elements and the two-wire design includes the lead and ground wires to mount to any surface. In order to wire this light, one of the wires will need to connected/spliced into the running light circuit (brown...
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  • Taillight Recommendation for a Flatbed Truck Built on a Chevy Silverado
    I think the part # STL68RB would be perfect for your flatbed truck (looks good by the way). The dimensions of the this oval light are 10 inches long and 3 inches tall. They do stop/turn/tail/reverse light functions as well so you would be totally set. I attached a review video for this light for you to check out as well. You might also be interested in the stainless steel trim piece part # A68SSB.
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  • Trailer Turn Signals and Brake Lights Not Fully Functional Connected to 2004 Chevy Silverado
    Since the trailer lights work fine on a different vehicle, the likely issue is on the truck. Most likely there is a dirty or corroded trailer connector causing the issue but I would still not rule out a ground problem on the trailer. On the vehicle, start by making sure the connector is clean and free of corrosion. Also check where the wires attach in the back if it is a 4 and 7-Way or if using an adapter. If you are using an adapter it could be at fault as well. After cleaning up...
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  • All Trailer Lights Blink When Truck Headlights and Turn Signals are Turned On
    The wiring harness on the trailer side is what is called a wishbone harness. It splits the running light signal so that you do not have to run a jumper wire from one side to the other. The yellow/brown wire is for the left side running lights and the green/brown is for the right side running lights. That could be what the problem is if you wired it differently. Make sure that the trailer lights are grounded to a clean and corrosion free location of the trailer frame. Also check to make...
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  • Trailer Right Side Running Light Does Not Work
    This sounds like a potential ground problem. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion...
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  • Newly Installed Trailer Tail Lights Work but Are Very Dim
    Dim trailer lights can be a symptom of a bad ground or wiring harness connection. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame,...
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  • Running Lights Not Working on Trailer After Installation of Optronics Trailer Light Kit # TL5RK
    There are many possible reasons why the running lights are not working on your trailer when using the Optronics Trailer Light Kit, part # TL5RK. First, I recommend checking the ground connections. The trailer lights on this kit will ground through the mounting studs. They will need to be attached to a clean and corrosion free bare metal surface. You will also want to make sure that the main ground from the trailer connector is attached to a clean and corrosion free bare metal surface....
    view full answer...
  • Brake Lights Turn Off when I Step On the Brakes After Wiring New Trailer Lights
    Yes, it seems like you have a ground problem on the trailer. I would start by checking the ground wire at the trailer coupler and making sure it is connected to a solid clean paint free spot on the coupler of frame. Then I would check the tail light assemblies. Tail lights are usually grounded through their connection to the trailer frame. If you have a plastic license plate bracket on the left side this could be the culprit. You should also check the brackets that hold the lights....
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  • Is Submersible, Under 80" Trailer Light Kit # TL5RK Sealed from Water
    While the wires and portions of the internals of the Submersible, Under 80" Trailer Light Kit # TL5RK are exposed to water when the ligth is submerged all of the important parts of the light and circuits are sealed so nothing gets damaged. So the water will fill in the assembly but then drain out without damage.
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  • Recommended Wiring And Trailer Light Kit For Harbor Freight Trailer
    Since you said you want to re-wire your entire trailer I recommend the Optronics Submersible Trailer Light Kit, part # TL5RK. This kit comes with 2 stud-mount lights, 2 amber side marker and clearance lights, a license plate bracket, and a 25 ft wiring harness with a 4-way connector. The mounting hardware is also included with this kit. I have also attached a link to an installation video for this wiring kit you can check out.
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  • Installation of Trailer Tail Light Kit # TL5RK
    To answer the second question first, the lights are submersible meaning water can drain out. You will want to seal up the electrical connections as best as possible. Heat shrink tubing works well. You can also coat them in liquid electrical tape, # SWC50122. For the side marker lights you would splice the power wire into the running light wire using a quick splice connector. Because this is a wishbone harness (it has 2 running light wires, one for each side) you would really only need...
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  • What Does 80 Inch Trailer Mean On Optronics Submersible, Under 80 Inches Trailer Light Kit # TL5RK
    The 80 inches means the width of the trailer. Trailers that are over 80 inches wide are required to have two side marker lights, one on each side. The Optronics Submersible, Under 80 Inches Trailer Light Kit with 25 Foot Wiring Harness, part # TL5RK, is designed for trailers under 80 inches wide. The 25 foot length of wire that comes in the kit should work fine with your 20 foot long boat trailer. If you are needing a longer 4-way wiring harness I have the Optronics 35 ft. Wishbone...
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  • Trailer Right Rear Tail Light Only Works Sometimes
    I believe that you are experiencing a ground problem, which can cause all sorts of weirdness. There are a couple of usual suspects that you can investigate to get to the source of the problem. First, make sure that the main trailer connector ground is attached to a clean and corrosion free bare metal surface. Next you will do the same for each of the trailer lights. The lights with tail light kit # TL5RK ground through the mounting studs. Make sure those are also attached to clean metal...
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  • Wiring Harness Diagram and Installation Instructions
    Your wiring should be pretty straight forward. The provided video link will walk you right through the installation. One of your lights will have a clear plastic lens on the bottom which will be used with the license plate bracket on the left side (drivers side) of the trailer. This will be hooked up with the wiring, including the yellow and brown wire. On the right side, you will use the green and brown wires to install that light. Your side marker lights will be hooked up with the brown...
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  • Running Light Fuse Blowing with Trailer Connecter to 2003 GMC Sierra and Tail Light Kit # TL5RK
    It sounds like there is a short that is causing an overload situation that is in turn causing the fuse to blow. The problem could be in a number of places, but I would start by checking the grounds on the trailer and on the truck. The ground for the trailer side plug should be attached to a clean, corrosion and paint free bare metal surface on the trailer frame. The lights ground through the mounting studs. They, too should be free of corrosion, dirt, and attached to a bare metal surface. If...
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  • Trailer Right Turn Signal Not Working When Connected to a 2000 Ford Ranger
    If your 2000 Ford Ranger has the factory trailer connector then there is a fuse for the trailer right turn and brake light located in the in cab fuse panel in location 7. But if this fuse is blown then the right brake light on the trailer also would not work. If you have an aftermarket wiring harness such as # 118344 then it ties into the tail light wiring on your Ranger. Otherwise you would have to follow the wiring as far forward as you can and fix any broken or pinched wires. I...
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  • Distance Between Tail Light Mounting Studs in Trailer Tail Light Kit # TL5RK
    The mounting studs on the lights included with trailer tail light kit # TL5RK are 2 inches apart on center. I have linked a video showing an example installation of this kit for you.
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  • Troubleshooting Trailer Lights that All Come On When Key Is Turned On
    The issue you are having is the circuit you chose to power the running lights circuit of your trailer 7-way. If that circuit sees voltage when the key is turned on and your trailer is connected then all of the trailer lights will illuminate when the key is turned on. You need to find a circuit that only sees voltage when the running lights/head lights are on to run to the brown wire. The running light circuit of your truck should work well. I attached a couple help articles on trailer...
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  • Troubleshooting Trailer Taillight Assemblies that Do Not Function
    The problem is either in the power to the light or the ground of the light. I would use a circuit tester like our part # PTW2993 to probe the wire leading into the assembly with the circuits on to see if the power is making it to the assemblies. If so, then you know the problem is in the ground. Since you already double checked to make sure the assembly is installed on a clean metal surface your next option would be to run a jumper wire from each assembly back to the main ground of the...
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  • Troubleshooting Left Taillight Goes Out on Boat Trailer when I Step on Brake
    If you have a bad or weak ground connection this can cause the problem you are seeing. When you apply the brakes, and the headlights are on, the ground connection needs to be good because when more amperage is drawn on the system, it requires a better ground to work properly. If you clean your ground connection points and make sure the taillights are grounded sufficiently, and the lights are still not functioning properly, you will need to check your connections and be sure you have...
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Info for this part was:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Expert Research:
Jeffrey L
Written by:
Tyler C
Video Edited:
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Installed by:
Cole B
Installed by:
Randy B
Updated by:
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Updated by:
Brian T
Video by:
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