bing tracking image
  1. Trailer Lights
  2. Custer
  3. Tail Lights
  4. Round
  5. LED Light
  6. Red
Red Trailer Tail Light, 18 Diode LED, 4" Round

Red Trailer Tail Light, 18 Diode LED, 4" Round

Part Number: CPL4R
In Stock
You Save: 40%
Trailer Lights
Add to cart
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Need help with installation?
Locate installers near me
Great Prices for the best trailer lights from Custer. Red Trailer Tail Light, 18 Diode LED, 4" Round part number CPL4R can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (2)
  • Q & A (0)
  • Videos (1)
  • Photos

Custer Trailer Lights - CPL4R

  • Tail Lights
  • Round
  • LED Light
  • Red
  • 4 Inch Diameter
  • Stop/Turn/Tail
  • Non-Submersible Lights
  • Custer

  • 4" Round red trailer tail light
    • 2-1/8" Deep
  • Functions as a stop, turn, and tail light
  • 18 Diodes
  • LEDs last longer and draw less amps than standard incandescent trailer lights
  • 3-Wire plug and grommet sold separately
  • Limited lifetime warranty

CPL4R Red Trailer Tail Light, 18 Diode LED, 4" Round

Video of Red Trailer Tail Light, 18 Diode LED, 4" Round

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

Video Transcript for Review of Custer Trailer Light - Stop Turn Tail Red LED Light - CPL4R

Ellen: Hey, everyone. I'm Ellen here at, and we're going to be taking a look at the LED stop, turn, and tail light. This is going to make a nice addition to your trailer to have all those functions in one light, and it's going to be an LED light as well, so that means it's going to last a lot longer and be just as bright, if not brighter, than an incandescent bulb while taking much less power. So it's easier to run more of these guys and have a much longer lasting light. Virtually no maintenance with these, because there's no bulbs to change out, no brittle filaments that can break on you. So all in all, a really nice addition to your trailer set up.

To get the power for this, or get it wired up, you will need to get a plug that will fit with this. It doesn't come with one, but you can find an option here at's even one listed on the product page as a related part. So that should look something like this guy right here. And just plug that in, and it's going to have all our functions running from that, so just make sure it's all fully seated down in there. And then at the back of that plug, we'll have our three wires.

Black wire is our running light signal, red wire is our brake signal or turn signal or both, and the white wire is our ground. So I turn on my power source, see our running light signal comes on, hit the brakes or the turn signal, and then it goes brighter. Go ahead and turn the lights out in the studio, so you need a better idea of how bright that is. So running lights signal, of course, not super bright, not intended to be. Just enough so that other drivers can see us in the dark when we have our lights on, or when it's raining outside and we have our lights on.Then we turn on the brakes, hit the brakes, hit the turn signal, and it gets brighter.

So much brighter with this signal, travels quite a bit further as it's supposed to. My wires are just getting tangled up here. I'm going to turn my lights back on, unplug this guy, and we can look a little closer at the details of this light. So as I said, it is an LED light. It's going to have a total of 18 diodes.

The outer diameter is about 4 1/4 inches across, 4 1/4 inches in diameter, and then the total depth is about 1 3/4 inches if we go from the front surface of the light to this back little protective bracket here. Just the light is about an inch thick. There is a grommet and a bracket that will fit this.Again, those are listed as related products on the parts page here at, so if you want to get those accessories to go with it, probably a good idea to do it now while you're getting this light. It's covered by a limited lifetime warranty, and that's pretty much all there is to it for our red trailer tail light. I hope this video has been helpful in deciding if this is the right light for you. We do have a lot of other options though here at Etrailer, so check them out if you're interested. Thanks for watching, and we'll see you next time.

Customer Reviews

Red Trailer Tail Light, 18 Diode LED, 4" Round - CPL4R

Average Customer Rating:  5.0 out of 5 stars   (2 Customer Reviews)


Nice upgrade for my work truck. The old lights were faded, can’t have that! Super bright. Worth the money. Highly recommend!



See what our Experts say about this Custer Trailer Lights

Info for this part was:

Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.