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3rd Brake Light Logic Module

3rd Brake Light Logic Module

Item # PP20-702
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Pacer Performance Vehicle Lights - PP20-702
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This light module filters out unwanted turn signal input from tail lights to ensure your 3rd brake light activates only when brakes are applied. Required when using a single light as a third brake light. 1-800-940-8924 to order Pacer Performance accessories and parts part number PP20-702 or order online at Free expert support on all Pacer Performance products. Guaranteed Lowest Price and Fastest Shipping for 3rd Brake Light Logic Module. Accessories and Parts reviews from real customers.
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Pacer Performance Accessories and Parts - PP20-702

  • Vehicle Lights
  • Third Brake Light Module
  • Pacer Performance

This light module filters out unwanted turn signal input from tail lights to ensure your 3rd brake light activates only when brakes are applied. Required when using a single light as a third brake light.


  • 3rd Brake light module filters out unwanted turn signal input to ensure your 3rd brake light activates only when brakes are applied
    • Required when using a single light as a third brake light
    • Great for domestic vehicles that typically use single filament bulbs
  • Maximum combined amp draw must be less than 1.5 amps

20-702 Pacer Performance Third Brake Light Logic Module

Installation Details PP20-702 Installation instructions

Video of 3rd Brake Light Logic Module

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

Video Transcript for Review of Pacer Performance Vehicle Light Parts - Third Brake Light Logic Module - PP20-702

Ellen: Hey, everybody. I'm Ellen here at, and we're going to be taking a quick look at the pacer brake logic module. Now, this allows you to add in a third or center brake light on your trailer or your vehicle. So if you want to put this on an RV or really anything else, and you're adding in that third brake light, this allows you to do that. Basically what it does is it allows you to tap into your wiring from the factory or from maybe a four-pole wiring harness, and it'll filter out the turn signals so that you're not getting a flash on that center brake. You're only going to get the brake signal, so it only comes on when you hit the brakes, rather than coming on if the turn signals are activated.So it just is pretty simple to wire up.

You might want to watch out for putting too much power through this. Some customers have said that if you put through more than 1.5 amps, it won't work, so just keep that in mind. Will work out pretty well for most LED lights, though, since they have a pretty low power draw.There's just three wires to worry about. The green wire is what's going to actually go to your center brake light, and then you'd want to, of course, ground that brake light out. The other two wires, one is going to go to your right turn signal.

The other is going to go to your left turn signal. It doesn't really matter which wire you use. They're just there to get the signal and then filter it out so that brake signal can work. This little guy is just that kind of the brains of the operation, so you want to make sure that maybe you zip tie this off to some existing wiring or just kind of zip tie it off to something so that it's not bouncing around all over the place, but it should be pretty straightforward as far as that goes.This can be used on any kind of domestic vehicle that uses a single filament bulb. You just really want to use this any time you're using a single light as that third brake light.

So maybe again, you're adding in a LED strip to your truck or another vehicle, and adding in that third brake light function, this allow you to use that and not have it flash.As far as the size, give you some quick measurements here. We'll get about nine and a half inches of wire to work with, call it about nine of really usable length there. And the little module itself, it's just about an inch or 7/8 of an inch long and about 5/8 or maybe 3/4 of an inch in diameter. So pretty small, pretty easy to set up just about anywhere you want to.Now, if you need some butt connectors to go with this, you can find a lot of options here at I would probably suggest using the pink ones.

Those will be for your smaller gauge wire, which this looks like it's about 18 gauge, so that will probably do you. If you're connecting it to anything that's a little bigger, you probably want to go with the blue, which is for 16 to 14 gauge wire, but you can find all of those here at to go with this install.I hope this has been helpful in deciding if this is going to be the right part for you. We do have a lot of other lighting accessories and wiring here at for all kinds of stuff, so check it out. Thanks for watching.

Customer Reviews

3rd Brake Light Logic Module - PP20-702

Average Customer Rating:  4.4 out of 5 stars   (61 Customer Reviews)

This light module filters out unwanted turn signal input from tail lights to ensure your 3rd brake light activates only when brakes are applied. Required when using a single light as a third brake light.


Logic module wired as directed allowed 3rd brake light to work perfectly on camper shell. I plug a 4 way trailer connector into the already installed 4 way plug on my Ford truck, run the wires up my truck body and the wires end in another trailer ‘female’ plug. A second ‘male’ plug is wired to the camper shell and includes the logic module so when my camper shell is mounted on my truck it’s a quick 4 way plug in to be legal with a working 3rd brake light.
The cost of this was just the logic module - cheap - the cost to go to installer and have this set up done professionally over $100 - thanks etrailer


Quick and simple installation - works like a charm. I used it to add a third brake light behind the spare tire of my classic Bronco. Some folks said it may not work with LED brake lights, but that's what I have on my Bronco and it worked just fine.


Wired up easy and now my campertop 3rd brake light works perfect.


Did not work on 2019 2500 Sierra Denali. Using on an ARE camper shell. Left side works but 3rd brake light flashes with right turn signal. I tied it into trailer 7 way plug for sources.

Thanks for the review! It sounds like it could be a bad ground issue. If you double check all your connections and make sure the ground wire has a clear and direct connection that is free of any debris or rust, then that may be all you have to do.
-- Etrailer Expert Brooke M - 10/28/2021


I'm a retired truck driver. I get a little fanatical about lights. I wanted a third brake light for my trailer. This piece makes it possible. Works out great.


If you own a 2020 or newer RAM this us not needed. Brake wire is in harness in front of bumper. White wire with purple stripe for topper brake light.


Didn’t work for me, third brake light on truck topper blinks with turn signals. Can’t recommend this one.

If you wired this like the diagram in the instructions, I would check your ground or for corrosion, which can cause faulty functioning.
-- Etrailer Expert Sierra K - 06/17/2022


I was skeptical of this module before purchasing because I didn't know about it. Have used other brands to perform these 3rd brake wiring functions previously. Soldered it between 4-pin connector and rear tail/brake light. Simple install and works great.


I was a little skeptical being as far down the system as this part was going to be installed that it would work correctly that there would be a flicker of turn signal in the brake light and there is not! It works perfectly and there's a tremendous timesaver for me. sets The standard in customer service. I bought a $15 part the total order was $20 and they babysat it all the way to my door and checked in frequently to make sure that I was happy. I bought a pair of fenders from them in the past and they treated me the same way this company is how business should be done.


The third brakelight module was easy to install, and works great, to isolate the high brake light on our Leer camper shell. The third light comes on with the service brake lights and 4-way flashers, but is properly isolated from the turn signals. It is a win-win.


Junk! Wasted a lot of time and wire terminals hooking this up exactly as directed to find out it doesn't work. Will wait and see if makes this right. Do not recommend.

I will have our Customer Service team reach out to you.
-- Etrailer Expert Jenny N - 05/09/2022


Bought for a camper shell on 2001 F150. Powering through 4-wire trailer plug. works but uses small gauge wire.


Installed this module to make a third, high mounted stop light work on my trailer. Easy installation and good instructions.

Still working as intended
UliN - 02/25/2021


This works on a 2013 Chevy 1500 Silvera do.


Great product!! Fast shipping


Worked like charm for a 3rd brake light on my pop up truck camper
easy install


Installed this inline with my third brake light on a camper shell. Product worked just as described. The test will come this winter after driving on salted roads


Works good. Has questionable reviews on a different online site but I think it’s just people who wired it incorrectly. Requires the input of both tail lights for the logic circuit to work. you need to have dual filament bulbs for tail lights, and then have a led third tail light as well. So if you don’t want to find or don’t have a constant break light wire handy easy way to tap into the factory tail lights.


This is a trailer-side connector and pigtail; will use it with truck's factory trailer connector socket to power truck camper's license plate light, and also an aftermarket third eye stoplight (in conjuction with a logic module). Good quality, perfect fit.




Product ordered was lost in the mail. Customer service was excellent and I received a full refund. The part then arrived the following day, almost 2 weeks after ordering. They have not indicated I would be re-invoiced, and although not a real expensive part, the fact they followed up on this matter was just great customer service. Will do business with them again. Highly recommended!
The 3rd Brake Light Logic Module was just installed, and works as described. One word of caution is that if you exceed the output, ( I found it to be about 1.7 amps) the 3rd light will not work. I installed a relay, triggered by the module , that switches higher amps to the 3rd light and it works perfectly.


if you change your trailer lighting over to LED and have a third (center) brakelight,
you need this module to make the lights work correctly.
there would be a similar one factory installed, but it works only with the older incandescent type bulbs.
the LED lights draw much less power and the older module is confused
so if both blinker flash together along with the center brake light, get this modul.
it will fix that problem


The module worked as advertised. Simple quick and rewarding.


Worked as it should. Delivery right on time


Simple, easy to install, did what it was supposed to.

Show More Reviews

Ask the Experts about this Pacer Performance Accessories and Parts

  • Adapter to Get Third Brake Light Circuit Isolated for 2019 Dodge Ram
    You can use the third brake light module part # PP20-702 to get a dedicated brake signal from either your trailer wiring or the vehicle wiring. Since the stop lights and turn signals on trailer wiring are on the same circuit you can use this adapter to convert the wiring to just a stoplight signal which you can use for powering a third brake light.
    view full answer...
  • Brake Light Logic Module for Use With 3rd LED Brake Light
    The logic box that you are asking about is our Pacer Performance 3rd Brake Light Logic Module # PP20-702. This is a piece of equipment that is required when using an LED light as a 3rd brake light. If there is a specific light style that you are looking for just let me know and I can make some recommendations for you.
    view full answer...
  • Could Pacer Performance 3rd Brake Light Logic Module # PP20-702 be Used to Power Camper Shell Light
    Your truck most likely already has a third brake light circuit ran underneath it for wiring to a truck bed camper. If you trace the trailer wiring back from the connector you should find an extra wire hanging free that has CHMSL on it that's for illuminating a camper shell third brake light. That said, the # PP20-702 can be used as a way to get a dedicated brake light circuit as well.
    view full answer...
  • Adding 3rd Brake Light Wiring for Camper Shell on a 2019 Chevy Silverado 2500HD
    To isolate the brake light signal on your 2019 Chevy Silverado 2500HD you just need the Pacer Performance 3rd Brake Light Logic Module # PP20-702. You can use the attached installation instructions for the 3rd brake light on your camper shell.
    view full answer...
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  • Will Pacer Performance 3rd Brake Light Logic Module # PP20-702 Fit 2019 Chevy Silverado
    The Pacer Performance 3rd Brake Light Logic Module # PP20-702 referenced in your question is a universal item that can simply be used to filter out the turn signal inputs for installation of a 3rd brake light (so the light doesn't illuminate with the turn signals). This is not custom fit for any certain model truck and is a hardwire application so it should work just fine with your 2019 Silverado. The 2 yellow wires from the module will connect to the turn signal wires on the truck and...
    view full answer...
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  • Can 2 LED Lights be Powered Using Pacer Performance 3rd Brake Light Logic Module # PP20-702
    There is nothing that says you can't use 2 LED lights with the Pacer Performance 3rd Brake Light Logic Module # PP20-702. And since LED lights draw such little power it is very unlikely that 2 LED lights would overdraw this module which is rated at 1.5 amps. I would not use an incandescent light with it though since they very well could draw more power than the module can handle. But 2 LED lights should not be an issue at all.
    view full answer...
  • Will 3rd Brake Light Blink with Turn Signal with the Pacer Performance 3rd Brake Light Logic Module
    The Pacer Performance 3rd Brake Light Logic Module # PP20-702 filters out the turn signal and only illuminates the 3rd brake light when the brake pedal is pressed. I have attached a photo of the installation instructions for you to check out.
    view full answer...
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  • Third Brake Light Wiring for 2019 GMC Sierra 3500 with Pacer Performance Logic Module
    I've attached the instructions for the Pacer Performance 3rd Brake Light Logic Module # PP20-702 but you'll need to connect the yellow wires to both the left and right turn signals, regardless of where you attach the logic module. Since this module looks to filter out the turn signals, only connecting to one turn signal would likely cause this product to operate incorrectly.
    view full answer...
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  • Wiring Camper Shell 3rd LED Brake Light to 2019 Chevy Truck
    To wire in the 3rd brake light from the camper shell to your 2019 Chevy truck I recommend using the Pacer 3rd Brake Light Module # PP20-702. This is designed specifically for single LEDs and will filter out the turn signal input so that it doesn't flash with them during travel. You will simply splice the 3 wires coming from the module to your truck's turn signal circuits and 3rd brake light circuit wire. I have attached an image to assist.
    view full answer...
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  • Pacer Performance 3rd Brake Light Logic Module Not Filtering Out Turn Signals
    The Pacer Performance 3rd Brake Light Logic Module # PP20-702 should indeed filter out those turn signals so that the 3rd brake light on your topper doesn't flash when they are on. If you have the module installed and the 3rd brake light is still flashing with the turn signals you will need to make sure everything is wired correctly. The two yellow wires coming from the module should be spliced into the stop/turn circuit wires on your truck's trailer connector (whether it's a 4-Way or...
    view full answer...
  • Troubleshooting Logic Pacer 3rd Brake Light Module PP20-702 Wiring
    Thanks so much for the picture. It looks like you're wiring up the Pacer Module # PP20-702 to a trailer side 7-Way connector, which you then plug into the 7-Way on your truck to power the topper's lights. I was able to zoom in on the connector you're using and the issue appears to be that the yellow and brown wires are simply attached to the incorrect pins. On the connector, the pin where you have the brown (running lights) wire attached is labeled "BLACK", which is reserved for 12V power....
    view full answer...
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  • Third Brake Light Still Flashes With Pacer Logic Module Installed
    If the third brake light is still flashing with the Pacer Performance 3rd Brake Light Logic Module part # PP20-702 installed then the unit is either installed incorrectly or faulty. I have attached a wiring diagram you will need to look over and make sure you have yours wired correctly. If all of the wiring appears to be correct then you will need to just replace the unit.
    view full answer...
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  • Adding Third Brake Light for Truck Camper Shell on 2000 Chevy Truck
    We have what you need in order to wire in your third brake brake light for the truck camper, though there isn't going to be anything specific to either your 2000 Chevy C2500 or your camper shell. You will simply need to add the Pacer Performance 3rd Brake Light Logic Module # PP20-702 and tap into the turn signal circuits of your Chevy. This converter will separate your truck's combined turn signal/brake lights, which you will need to do so your camper shell's brake light will blink along...
    view full answer...
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  • How to Wire Third Brake Light on Camper Shell
    Yes we do have a logic module that will work to wire your third brake light on your camper shell, part # PP20-702 the Pacer Performance 3rd Brake Light Logic Module. The third brake light needs to have a brake signal only, and if you are tapping into your trailer wiring, or tail lights wiring the turn and brake signals will be combined. The logic module filters out the unwanted turn signal inputs. This prevents the third brake light from flashing when you apply your turn signal. The...
    view full answer...
    Image 1 for
  • Module for Separating Out Dedicated Stoplight Circuit for Salter with Running Light/Stop Light
    The running light/brake light on your salter should have a wire ran to it for the brake light and one for the running light. You'd want to use the # PP20-702 to isolate out the brake light like you need to run to the stoplight circuit of your salter light and then the current running light circuit you have present would then run to the correct circuit on the light and you'd be set.
    view full answer...
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  • Where Exactly to Install Pacer Performance PP20-702 3rd Brake Light Logic Module
    The module is weather proof according to the manufacturer but I'd recommend installing it so that it's as well protected as possible. Inside the camper shell would be ideal as the 3rd brake lamp wiring is easy to access there.
    view full answer...
  • Pacer Performance 3rd Brake Light Logic Module Wiring
    Whenever wiring Pacer Performance 3rd Brake Light Logic Module # # PP20-702 the yellow wires must go to each brake/turn signal and the green wire goes to the 3rd brake light. The reason why you need to hook both up is because the logic module filters out the turn signals and applies only the brake, so wiring only one may cause it to not work properly.
    view full answer...
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  • Installation of Pacer Performance 3rd Brake Light Logic Module on Truck Topper
    When installing the Pacer Performance 3rd Brake Light Module # PP20-702 you will need to connect the yellow wires to both the right and left turn signal (one signal to each wire), and then the green wire will wire into your 3rd brake light on your truck topper. This module can be used on either LED or incandescent bulbs.
    view full answer...
  • Could Both Wires of 3rd Brake Light Logic Module Be Ran to Single Turn Signal Circuit
    The part # PP20-702 has to connect to both the left and right hand turn signal/stoplight circuits in order to separate out the stoplight. The reason that is because it waits to see voltage on both circuits at same time to then allow the stoplight circuit of it to activate. If you were to run both wires to the left blinker circuit it would basically just blink with the left blinker since it would think both blinkers are on.
    view full answer...
  • Troubleshooting Pacer 3rd Brake Light Module Installation on 7-way Trailer Plug
    In most cases when this occurs, it's down to the wiring being connected to the wrong spots on the 7 way trailer plug. You'll want to be sure you're using the 3 o'clock and 9 o'clock pins when looking at the back of the plug. I've attached a wiring diagram that shows this in better detail that I would ask you to confirm is how you have this wired. If this is exactly how you have it wired please let me know and I will be happy to look into this further.
    view full answer...
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  • Wiring A 3rd Brake Light For An ARE Camper Sheller For A 2002 Chevrolet Silverado 2500HD
    You are correct, some GM trucks had a blunt cut wiring harness already installed in the truck for a camper shell wiring. That is the light blue wire tucked up above the spare tire like you mentioned. That light blue wire is the wire that feeds the 3rd brake light on the back of the cab. You may want to confirm first by cutting it, and stepping on the brake pedal, if the 3rd brake light does not turn on, then it's the right one. You also, might have to run an independent ground, it will...
    view full answer...
  • Connecting 3rd Brake Light in Leer Cap to 2019 Ram 1500
    Actually, the correct part to wire in a truck bed cap's third brake light is the converter # PP20-702. Since your 2019 Ram's turn signals and brake lights run on one circuit this separates them so the light on the cap functions with just the brake lights. Each yellow wire connects to the truck's brake light/turn signal circuits, one on each side, and then the green wire goes to the third brake light. You can use the truck's trailer wiring to find the proper brake and turn signal circuits....
    view full answer...
  • How to Wire Third Brake Light on Camper Shell of 2011 Ford F-150
    Though we are not privy to any specific wire colors as there is no standard, I can help you with how to wire the third brake light for a camper shell on your 2011 Ford F-150. All you need to do is use the Pacer Performance 3rd Brake Light Logic Module # PP20-702, which has three wires, two yellow wires and a green wire. Simply tap into your F-150's turn signals with the yellow wires and run the green wire to the third brake light on the camper shell. What this module does is filter out...
    view full answer...
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  • Separating Turn Signals from Brake Lights for Third Brake Light on a Camper Shell
    Any basic converter box will separate out turn signals from brake lights but I recommend the vehicle to vehicle converter # 118158. On the input side the white wire is ground, yellow connects to the combined left turn signal/brake light wire on the vehicle, and green connects to the right turn signal/brake light wire. These all have to be connected for the box to work. On the output side the red wire will be brake lights only. Green and yellow are turn signals only but can be capped off...
    view full answer...

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