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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.
Features:
California residents: click here
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Ellen: Hey, everybody. I'm Ellen here at etrailer.com, 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 etrailer.com. 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 etrailer.com 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 etrailer.com for all kinds of stuff, so check it out. Thanks for watching.
I have a 2011 F150 and this did not work in my application. I correctly installed it according to the supplied diagram with the diodes in place and in the correct direction. No change, the taillight continues to blink with either/both indicators. I checked the amperage on the lights, .28amps so below the 1.5amp threshold, and also checked whether the diode had failed - nope. I even tried installing the diode backwards, no luck. I suspect the module is faulty but have no way of knowing without specs on what to test for.
The instructions were basic and clear, and the installation was simple. My Overland AT Atlas topper's third brake light brings its wiring down the rear driver's side above the driver's side rear brake/turn indicator of my 2026 Ram 2500. I ran a positive wire from the passenger side tail light to the module installed in the driver's side tail light, connected the driver's side brake light connection, and made a clean ground behind the tail light. All works as advertised. I did not need the provided diodes.
Works perfect for adding a third brake light to my truck/camper rig (which has an aftermarket bumper and lights) on a 2019 Chevy Colorado
Brooke M.
5/14/2025
Booyah! Now you're cooking with gas! Were you able to go on a couple camping trips over the last year?
I finally got to install the brake light logic module and it worked as advertised, very happy and etrailer were great to deal with, even though the part was backordered they kept me informed and up to date.
Just installed and works great. Makes the third brake light look factory and no more flashing with one turn signal.
The module is defective. Courtney G from your company said that the manufacturer told her to tell me to go find some 1/4 watt diodes to install and see if that works. There is no diode store any where near me!
Did not work as advertised. Waiting for replacement. Blinks when directional on (left or right)
Great device, perfect for antique cars as well as trucks/trailers
This module is doing the job!
The story:
A good looking all windows included long bed Ranger camper shell topper came along, it had the interior and brake lights but the wires were cut back.
There are non-working or completely absent 3rd brake lights on toppers all around here on vehicles. However, you just never know, and now my Ranger's cab's 3rd brake light would be covered with the topper on it.
I didn't want to start cutting wires on my old, old, but relatively nice Ranger in case I made the wrong cut. So I through about using the 4-flat trailer harness as I had that free (and I had an old harness piece from an old boat wiring kit). But the turn signal would cause it to blink.
I tried countless combinations of the wiring running off the 4-flat trailer connector. I had really odd things happening during the trial and error process, such as the blown fuse (first time ever for me) to the warning chime in the cab telling when the lights or keys were in the ignition going off when I applied the brakes.
So I thought I would try this logic module out.
At first I over thought it and had tried a couple combinations out with some old boat trailer lights that might have been cool on the topper.
But then simple and straightforward ended up being the way to go.
The green wire on the logic module to the brake light. The yellow wire to either turn signal connecting wire. A separate spare piece of wire from the brake light to the trailer harness ground. That's it.
The topper is not on the truck as of this review, I hope to get it painted since the green topper clashes with the red truck. When I get it on, I can easily plug the -4-flat harness into the trailer harness. It's rare for me to use the trailer.
I can easily revisit the wiring in the future, using the 12-volt power supply from the harness hook up I could power topper interior lights on switch or add lights to the topper. I could very well splice on the trailer wiring harness as well under the truck if I need the trailer harness for the trailer without cutting into my Ranger's wiring.
Either way, this module made getting that third brake light to not blink and illuminate when the brakes are applied. That's what I wanted.
So far so good, this is a great way to be able to add a third brake light to a trailer.
I have a small camper trailer and added a Haloview CA115 backup camera and light combo. I wanted the light to work as a center brake light. This fit my needs exactly and was supper easy to wire in. Could not be happier.
Great product- helps me to be more visible and safe
Eau to install and works great
Works as advertised.
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.
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.
3rd Brake Light Logic Module easy installation and works as advertised.
on GMC 2024 LED lights it does not keep the test pulse from flashing on 3rd brake light. Blinks twice per second while truck is running and continues when shut off for extended period. e-trailer said they would take it back but I would need to pay for the shipping.
It does what it supposed to do.
Product probably works fine. I don’t know because I received it a day later than was promised and so I didn’t get to install it before I gave the trailer to my son and daughter-in-law. When I sent an email to etrailer asking them for a refund on the difference between the expedited shipping cost and the regular shipping cost, I received a boiler plate email thanking me for my business which only made me angrier. NOT A GREAT EXPERIENCE.
Easy hookup for truck cap’s third brake light. I piggybacked the L turn mini fuse and the R turn mini fuse and connected the module there at the fuse block under the hood—it rests under the cover. One pair back for power and ground to the light. I didn’t tap into the trailer plug so as to prevent future water/salt/corrosion issues.Nice product.
Jeff M.
5/16/2024
Still working great.
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.
Works as stated
Got here ahead of date expected. Does what I needed it to do.
Purchased a converter(118158) to solve the blinking stop light issue.
That did not work, as I have LED taillights, and in the description it says it will not work with LEDs. Purchased this
“Recommended “ logic module” (20-702), and this isn’t working either.one side works and the other doesn’t .Amperage is way below 1.5 amps.Checking the description for the product doesn’t say it won’t work with LED’s. What’s next?
Trazz
5/9/2024
I received a second logic module as a replacement. I wired it in as the instructions said. Unfortunately, it doesn’t work. I think the problem is that it also doesn’t work with LED taillights. I think the only solution is to wire the stop light directly to the vehicle center stop light. This is not an Etrailer issue. Probably should specify in the description that it won’t work with LED taillights.
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Mike L.
8/14/2025
We reached out to Pacer, and they stated that it sounds like the module is faulty, so we're shipping out a replacement.