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: 4.7 out of 5 stars (150 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.Ok 940487
939630
939626
The right turn signal and brake light quit working about 300 miles into our first trip out. 937924
I won't say it was simple, but the instruction and videos get you to completion with confidence. 936808
perfect Etrailer is the best! 936436
935499
We have not installed this item yet. 935451
Wasn't sure if I needed this or not. I purchased it in case I did. Looks easy to install with great video and instructions. 934227
GOOD QUALITY. GOOD PRICE. WORKS GREAT. EASY INSTALL ON MY JEEP. 932568
Items arrived on time, good job with your shipping. 927354
924343
923206
917452
You guys rock!!!! Great work 915861
what can I say, it's under the dash 909313
Good product. etrailer’s install video was spot on! 906930
Have a issue with 2016 Wrangler. Before install the brake light works anytime, even without key. After install the brake lights only work in the On/Run position (not in Accessory position). I use the Even Brake system which requires a brake signal, thus I have to set the ignition switch to On when I am towing which means the odometer will count the miles and who knows what could be damaged by leaving the ignition switch turned to On for several hours. This relay does exactly what it says, but I would prefer that it work in the Accessory position which is what is recommended in the Jeep manual for towing. 904244
Easy install. The only hard part is getting both hands under the dash and while laying on your back. 903889
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
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