Relay works with your tow bar wiring system to ensure that your towed vehicle's turn signal lights flash in tandem with your RV's lights.
Features:
The purpose of a brake light relay kit is to prevent your towed car's brake signal from overriding the turn signal that comes from your RV. When your towed vehicle is properly wired and connected to your RV, its indicator lights will illuminate as you engage the turn signals in your RV. However, if you have only a four-diode system in place, the turn signal will be overridden by your towed car's brake signal as soon as your supplemental braking system presses the towed car's brake pedal. As a result, drivers behind you know only that you're slowing down and not that you are turning.
Installing a brake light relay in your towed vehicle fixes this problem by ensuring that your car's brake signal does not override the RV's turn signal. Therefore, your towed car's lights will function in accordance with your RV at all times.
Is a Relay Required?
To determine if a brake light relay is needed to properly wire your vehicle to be towed, answer the following questions.
Are you using a supplemental braking system that depresses the brake pedal in your towed car?
No - You do not need a brake light relay.
Yes - You may need a brake light relay. Continue on to the next question.
Do the brake lights on your towed car illuminate while the engine is off?
No - You do not need a brake light relay.
Yes - You may need a brake light relay. Continue on to the next question.
Do your towed car's brake lights act as both the brake signals and the turn signals?
No - You may need a brake light relay. Continue on to the next question.
Yes - Your towed car has a combined lighting system. You will need a brake light relay to ensure proper activation of its signal lights.
Does your towed car have separate brake lights and turn signals?
No - Your towed car has a combined lighting system. You will need a brake light relay.
Yes - Your towed car has a separate lighting system. You may need a brake light relay. Continue on to the next question.
Are you wiring your vehicle with a six-diode kit or a TowDaddy custom wiring harness?
No - You will need a brake light relay to ensure proper activation of your towed car's signal lights.
Yes - You do not need a brake light relay.
Most towed cars require the normally open installation method. Ford and Lincoln models with neutral tow kits and most automobiles that have a push-button start function will require the normally closed installation.
Normally Open
The diagram and steps shown below demonstrate the installation for normally open applications. Be sure to follow the instructions included with your relay kit for a more detailed process.
Normally Closed
The diagram and steps shown below demonstrate the installation for normally closed applications. If you have a Ford or Lincoln that has a neutral tow kit or if your car has a push-button start feature that will not start the engine when the brake fuse is removed, then you need to perform a normally closed installation. Be sure to follow the instructions included with your relay kit for a more detailed process. Normally closed operations may require additional connectors and length of wire that are not included with this kit.
Average Customer Rating: 4.8 out of 5 stars (132 Customer Reviews)
Relay works with your tow bar wiring system to ensure that your towed vehicle's turn signal lights flash in tandem with your RV's lights.Installation went well, instructions were good. etrailer's installation video helped a lot. Works as described. Installed on a 2019 Ford F150. Needed the micro dual fuse tap to complete. 895736
The kit was delivered on time and my mechanic said everything looks good. Noah from etrailer was super nice to work with and gave me confidence in the purchasing experience. I will do business with etrailer in the future! 899315
I love the quality of the products I ordered. Customer relations was very good as well, they kept me informed and even though it took several weeks and etrailer had to wait on items to get to them, I was communicated to well. I know it’s important in who you deal within this day and time and you can trust etrailer. 899231
Works as expected. Fairly easy install. 893015
This review is for E-Trailer. I ordered a complete dinghy towing set-up for the dinghy as a towbar came with the RV we purchased. I called E-Trailer and spoke with a very knowledgeable young lady and when I told her what I needed in layman’s terms she came up with what I would need to complete the dinghy preparation in order to safely tow it behind our RV. Everything they said it would do went just as the instructions directed. I ordered a Roadmaster Falcon 2 set up for the dinghy and they suggested a Blue Ox self contained braking system for the SUV itself. hey also suggested the complete wiring system and plug for the dinghy. To my amazement after the RV and dinghy were connected that also was as easy as they said it would be. Our first tow with the dinghy was great and the unhooking was also a very easy experience. This company was awesome to work with. Thank you for your knowledge and great products. 893190
Not too difficult to install in a Jeep Wrangler JK. The videos were almost necessary for me. The relay works as advertised. Makes sure to remove the fuse(s) associated with the brake lights. 874669
Fast delivery. You tube videos were very very helpful. 872058
Product recommendations said I needed this for my Jeep JL (2019) to go along with braking system. Found out the pedal switch goes to sleep after 5 min, so you don’t need this. 871594
Installation procedures were well documented. Worked the first time and still do! 858378
good service. just what I ordered. 855528
No issues it went in as described The step by step directions and video were spot on 849995
So it has been a year since installing on our Jeep JL. The install was straight forward. Made many tows with our Class C and has worked flawlessly everytime. Can not say enough good things about etrailer. Purchased several products from them. Great customer service befire and after purchase. Fast shipping 830435
Instructions were perfect and easy to follow. Highly recommend! 808963
Excellent product. It is well built, durable and easy to connect and disconnect. The LED lights on the sides are also a great safety feature. I recommend getting the cover to protect it from the elements when not in use. 807224
Great product and value 808210
Great product, easy instructions. Works as advertised 808203
Installed per instruction had one minor question support from etrailer was prompt and excellent 804587
So Happy Here!!! Fair price, Great Quality, Everything fit perfectly and looks Great on my Grande Cherokee 804069
Works as expected, with no problems. I am happy with etrailer and their customer interactions. I installed a Roadmaster tow bar and brakes on my Honda CRV two years ago. I had a problem and they helped me solve it with a new brake light relay kit. All parts of the install on the toad and motorhome are functioning perfectly. 800384
Works good 794222
Works as advertised. 793985
Works as it should. 783046
This works perfectly and have driven several thousand miles with it. The installation did not work as specified. My model Jeep - a 2016 Cherokee with Active Drive II has two green wires with light green stripe, neither of which worked as the bypass. I tried it myself and took it to two mechanics; neither could find the correct wire or would attempt the work. I finally installed the relay in the fuse box. In my car, the brake light fuse is paired with the gas cap release in a micro3 (ATL) socket. This saves space in the fuse box for the manufacturer. The center pole is a shared hot for each of the two circuits. I installed a micro2 (ATR) fuse holder that has space for two ATR fuses (similar to the one supplied but has space for two fuses, not one). In the lower fuse holder socket, I installed a 10A fuse for the gas cap release. In the upper socket, I installed a 10A fuse for the the relay. I attached the blue relay wire to the red pigtail of the fuse holder. In the brake light side of the fuse box I installed half of an ATR fuse along with a tin fuse tap. I attached the black relay wire to the fuse tap. Finally I attached the red wire to the always hot wire on my 6-pin socket. This ensured that the relay is active as soon as I plug the Jeep into the motorhome. All the parts are available at a local auto parts store. Wiring this way took less than an hour, did not require cutting the brake light wire under the dash and *may* prevent voiding the warranty, although I did not verify this. 783037
Easy install, and beats aux. lights, no more bolt/unbolt of lights and looks soo much better. 777208
I recommend watching the etrailer video first, it will make the installation much easier! 769481
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