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Old 02-08-2021, 02:24 PM   #1
Join Date: Feb 2019
Posts: 43
Hoping to use AUX tow connector for brake system monitor

I'm in the process of installing an Invisibrake system in my toad and am hoping that I can use the coiled connector to carry the monitor signal up to the dash of the RV.

The center (Aux) terminal on the 7-pin connector seems ideal to carry the signal but I wonder if Freightliner/Tiffin has it going anywhere. Ideally there'd be a connection in the dash where I could hook up to so connecting/disconnecting would be simple. Is anyone familiar with how it's used/not used? I'd rather not run another wire up to the dash if one is already there and usable.
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2016 Tiffin Phaeton 36GH
2013 Nissan Xterra S 4WD manual transmission
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Old 02-08-2021, 03:35 PM   #2
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Use the trailer electric brake controller pin and wire instead. Many of us have done so. That wire should appear on a Freightliner connector under the dash. If no one has modified the trailer electric brake controller wiring, that is.
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport
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Old 02-09-2021, 08:57 PM   #3
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I think the center pin is for back up lights. I disconnected it and ran the invisibrake signal to that pin on the car end. I then ran a wire to the front from the center pin on the rear. Has worked for two years.
Jim & Sue
2018 Winnebago Forza 38W w/2007 Jeep Liberty TOAD
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Old 02-21-2021, 10:55 AM   #4
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Thanks for the info. I'm having trouble finding a wire labelled with anything that resembles something coming from the tow connector. I've got the dash panel off (not the gauge cluster but the panel with the radio/GPS, rocker switches, etc.). I may have to call Freightliner or Tiffin to help locate the connector with the wire unless someone here has more specific info (like, is it behind the gauge cluster?)
2016 Tiffin Phaeton 36GH
2013 Nissan Xterra S 4WD manual transmission
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Old 02-21-2021, 11:15 AM   #5
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I would look around the trailer break connection by the foot petals that's where a controller would hook up
2005 Itasca meridian
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Old 02-21-2021, 11:30 AM   #6
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Try searching for, installing a brake controller in your rig. Most controllers have adapters to hook into a plug somewhere under your dash. Etrailer has lots of videos on this stuff.
2015 Fleetwood Flair 26D
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Old 02-21-2021, 01:41 PM   #7
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Here is a link to a Google search of iRV2 posts with the terms "Freightliner" and "brake controller" in them.

Here is a link to the same search, but only on the Freightliner forum.

Here is a link to the same search, but only on the Tiffin forum.

Some of the search results will contain pictures of the under-dash area

See this post, too. It's from the owner of a 2019 Phaeton.

You can buy an adapter harness or "pigtail" and eliminate splicing into the coach brake controller wiring. Keeping the factory wiring intact is usually the better option than not doing so.


I note that etrailer says this adapter works for:

2004 - 2015 Freightliner SL Series with factory Tow Package
2004 - 2015 Freightliner XC-Series with factory Tow Package

Or, this one from eBay:

eBay- Freightliner XCM RV trailer brake harness

I just know about these adapters; you should confirm for yourself that they are correct for your application.
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport
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Old 02-21-2021, 01:47 PM   #8
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Your trailer brake controller wires should be in a small bundle of 3-4 wires, probably rolled up and tied to the bundle under the dash next to the steering column. You should have a black, red, blue and maybe white wire. The blue wire is the one to the controller pin in the connector on the rear. I used mine to run an LED line to a pressure switch in the Jeep's air line.
2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previously '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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Old 02-24-2021, 01:19 AM   #9
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I used the blue (brake controller) wire to send the "TOAD brake applied" signal up to the brake controller receptacle under the dash of my MH53J motorhome. "TOAD BRAKE APPLIED" is generated by the brake light switch of the TOAD, which I picked off at a fusebox in my 2016 F150 Toad.

I procured a mating brake controller plug on EBAY and ran the blue wire to a current-limiting resistor, then connected that to an LED anode. Connect the LED cathode to ground. The LED was mounted on a blank switch insert on the motorhome dash. So when using the TOAD, plug in this custom wired plug to the standard brake controller receptacle. If I want to pull a trailer with brakes, just unplug it and plug up a brake controller, since the wiring to the 7 way is not modified.

The LED works fine. Only problem ive had is when I accidentally hit the brake pedal height adjustment button on the Toad one day, then forgot about it. This changes the slack in the cable that pulls the brake pedal on my system. A few days later with the Toad hooked up, the brakes were not applying as fast, I went back and checked the cable slack and moved the brake pedal height back up a bit. Problem solved.
George and Linda - 2007 Coachmen Mirada
Bought used with low miles. DIY fixer upper
2016 F150 Supercrew TOAD
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monitor, tow, brake

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