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Discussion Starter · #1 ·
I was about to pull the trigger on the RF Prodigy controller despite somewhat frequent complaints about having to use a Chevy to pair it and then hook it up to the Metris, when I stumbled onto the Curt Echo controller. Seems to be a few months on the market.

Smartphone app controlled and it is said to plug into the 7 blade connection on the factory tow setup. Plug it in, plug the trailer into it and run the app. According to eTrailer folks, that is all there is to it.

It will be here Friday.
 

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Like the Tekonsha RF, you have to turn the controller off if you are using your hazard lights, but you can turn it on manually if necessary.
https://www.etrailer.com/question-334867.html
Saying "This is more or less to discourage people from driving down the road at highway speed with the hazards on." sounds like a poor excuse for a design limitation to me. I can think of a couple of ways to get around the problem,
Admittedly, there are some places where you can't drive using hazards
https://drivinglaws.aaa.com/tag/hazard-light-use/
but others where it is recommended if you are going slower than the rest of the traffic
http://ontariorulesoftheroad.blogspot.com/2013/11/can-you-drive-with-your-hazard-lights.html
Anyway, it is controversial, but there are times I use them, like pulling this back from a parade on a rainy night.
 

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Looks awesome. Please post a follow up!
 

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Discussion Starter · #4 ·
Like the Tekonsha RF, you have to turn the controller off if you are using your hazard lights, but you can turn it on manually if necessary.
https://www.etrailer.com/question-334867.html
Saying "This is more or less to discourage people from driving down the road at highway speed with the hazards on." sounds like a poor excuse for a design limitation to me. I can think of a couple of ways to get around the problem,
Admittedly, there are some places where you can't drive using hazards
https://drivinglaws.aaa.com/tag/hazard-light-use/
but others where it is recommended if you are going slower than the rest of the traffic
http://ontariorulesoftheroad.blogspot.com/2013/11/can-you-drive-with-your-hazard-lights.html
Anyway, it is controversial, but there are times I use them, like pulling this back from a parade on a rainy night.
I am under the impression (from an eTrailer tech response) that this is also an issue with wired brake controllers. There is a flasher interrupt product (wired) available for this very issue. Don’t know if it works with RF systems.
 

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I checked Tekonsha, with this message:
I am using the Tekonsha RF with my 2018 Metris. Best controller I have used in 25 years. However, there are times when I need to use my hazard lights (towing large float to parades). Can I bypass the LR brake light lines around the controller and connect the CMHSL to pins 5&6 into the controller?

Their answer:
Thank you for contacting Tech Support. When you turn on the 4-ways of the car, you are activating both the right and left stop/turn circuits of the trailer. This makes the Prodigy RF believe that you are pumping the brake pedal. Terminals number 5 and 6, have to have the combined stop/turn circuits on them, for the control to operate, with the brake pedal. You cannot bypass this. What you are encountering is just the nature of the control. There is no resolution for this. If I can be any help in the future, please let me know.

and etrailer said:
The Tekonsha Prodigy RF does not splice into the brake output circuit on the tow vehicle. It operates off of radio frequency and interia. If you are referring to a standard Prodigy or the P2/P3 then yes, you could slice into the third brake light circuit.

to which I replied:
Great, thanks, but the RF must also use the brake lights as the hazard lights activate it. Couldn't you bypass the L&R brake lights and use the 3rd light instead (attached a diagram)?

and they responded:
My apologies, I didn't quite understand your question at first. Unfortunately, I cannot recommend you modify the Tekonsha Prodigy RF in this way. I am not saying it would not work but this is becoming too much of a liability to offer advice on as you are changing the way it is intended to function. Sorry!

Sounds like it would work, but they have to cover their butt.
 

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I think this is one of the artifacts of being stupid and using brake lights for turn signals. Give me back the days when on a Mercedes, the (amber) turn signals, brake lights, and tail lights used not only separate bulbs, but distinctly different places on the rear light assembly. I have no idea why we keep moving to less intelligent, harder to understand rear lighting in this country.
 

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We have a wonderful dual axle dual horse trailer called a Brenderup. These are engineered and mfg in DE and were for a while available in the US - parts were brought over and assembled in Texas, much like our Metris is today. These trailers feature surge brakes which work really great and eliminate the need for electric brake control. My guess is that most trailers in Europe are thusly equipped which may explain MBs lack of focus on the biz of brake control.
 
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