Hey there, recently installed a Curt Triflex controller on my VW TDI attached to the factory harness. As soon as the trailer is plugged into the vehicle, the Triflex begins clicking non-stop and the display flashes. Does this brake controller also need the relay installed? Called support at Curt -- they had me run a test via a test light that showed the brake controller is working fine without the trailer attached.....
Try hooking up to a different trailer and see what happens, if it works fine you have an issue in your trailers wire harness and need to start troubleshooting. If it happens again I would say you have a short between the red wire on the controller and the power wire. Worst case is you have a faulty unit.
Helpful Links
@DavidB Thanks for the feedback. This one was a head scratcher for certain. I was finally able to find the issue and figured it is worth while putting it in the comments. This trailer has the trailer breakaway system including the breakaway switch, battery and charge regulator. I started disconnecting things to see if I could find the faulty component, and it turns out the charge regulator was the issue. Despite it being in a sealed container, it had become corroded and shorted out. Once it was removed, the brake controller operated normally. I have now ordered and installed a new breakaway system.
I am not quite confident with the additional relay when installing a RedArc tow pro elite since the keep alive voltage of the hot battery ensures that the calibration function remains in memory. Any removal of that keep alive voltage means that a recalibration is required after each engine shutdown. Based on that is it not counter productive to install a relay?
The black wire at the controller is from a constant source and will ensure programming is maintained. The additional relay is connected to the brake pedal switch. You will need this relay for your system to function.
Thanks
I see that this bulletin is for a Tekosha brand controller. The controller I'm looking at is a Redarc one. Is this wiring fix still needed? 2012 Touareg TDI with factory tow package. Thanks.
Yes, you will still need additional components to install a Redarc controller in your 2012 Touareg. I have linked the page showing all of the brake controllers for your Touareg - which also shows an "Installation Notes" section to let you know which controllers require additional parts and which don't. That section will also let you know what the VW part numbers are.
Helpful Links
bc-2012_volkswagen_touareg.htm?style=with+factory+tow+package
FWIW I called the manufacturer and as of 3/22/2021 this bulletin still applies, much to my chagrin.
Thank you for the update!
@KefG ...forgot to mention we have a 2017 Audi Q7.
The instructions about the relay are helpful, but: a. Where would I find/buy a 12V, normally open relay? Is there a part number to look for? b. How do I install a 5 amp fuse in-line? c. Where would I find/buy a 5 amp in-line fuse? s there a part number to look for? d. How/where do I find a 12V source to connect the relay to? e. Are there other connectors I'd need to install the 5 amp fuse or to connect to a 12V source? If so, what are those parts and where do I find/buy them? Thanks for the help and your patience.
a. You would find a normally open relay at an auto parts store. b. To install an in-line fuse you would use something similar to part # SWC9545 . It would just be in place of some of that 12 gauge wire. c. We have a mini fuse kit as part # PT62FR that you could pair with the part above to accomplish this. d. Usually a 12V power source that is hot all the time can be found with your cigarette plug or if you have an accessory outlet in your vehicle. Otherwise you'll just need to use a circuit tester to see which wire is hot all of the time. e. You'll need 12 Gauge Butt Connectors # DW05745-5 as well as a ring terminal, part # 44-5310A or # 44-5356A , to connect to your battery.
Do I also need a relay for a 2018 Audi Q7?
Yes, you will need it for your 2018 Q7 as well.
If I have the Tekonsha 90160, for a 2008 Touareg, will I need the relay too?
No, you shouldn't need that relay.
I've heard that the new Tekonsha P3 does not require the relay anymore. Is this true?
I'm not aware of a new version of the Tekonsha P3 # 90195 so I can't really speak to that. Last we knew this was still a thing which is why we say 2009-current Volkswagen Touregs and Porsche Cayennes. Where were you seeing this new info?
@JonG , is the relay needed with a 2013 Q7 with the P3?
@JasonR Yes, you will need this for your 2013 Q7 application.
I have a 2015 Touareg. Need to install a trailer brake controller. CANNOT find proper documentation that would tell me what parts I need to be able to complete the install. Are you able to sell me a plug-and-play kit? If not, can you provide the exact parts list I need to buy from you? Thanks
The needed components to install a brake controller on your 2015 Touareg are actually only available through a VW dealer. I would check with a local dealer to see how you can obtain these parts - I wish we had them available on our site but they are genuine VW parts.
@DanielM You need these parts from ECS Tuning / VW Dealer: VW Connector Housing 1J0-972-782 Qty 1 Wire/Terminal Assembly 00-979-228 Qty 2 See this etrailer video for how to: https://www.youtube.com/watch?v=t-F5hn66rOg
"Another great purchase. Low prices, fast shipping and great customer service are always provided."
Questions and Comments about this Article