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Old 10-12-2009, 10:13 PM   #1
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wiring harness adapters for a trailer with electric brakes

Ok
my freightliner chassis has the plug under the dash to plug in a brake controller

I have three tow items
a car
a cargo trailer with elect brakes
and a flat bed auto transport with electric brakes
who makes an adapter for the freightliner connector? I would hate to to have to cut the plug off and splice in a generic harness from a prodigy or some other brake controller so i can have trailer braking.
i have searched all over and i figure somebody here tows other things besides a car four down,
tia
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Old 10-13-2009, 10:35 AM   #2
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I'd suggest you wire the MH for the standard seven pin electrical umbical cord and then make your adaptations in the cord used for the specific unit you intend to tow. My MH is wired for the normal seven pin configuration. My toad requires a six pin input so I have a seperate umbilical cord for that application. Adapters from 7 to 6 or 7 to 4 may be available but I can't say for certain.
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Old 10-13-2009, 10:57 AM   #3
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Quote:
Originally Posted by FleetMan View Post
Adapters from 7 to 6 or 7 to 4 may be available but I can't say for certain.
Both are readily available at any trailer hitch store.

Rusty
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Old 10-13-2009, 11:17 AM   #4
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Describe or post a photo of the plug..

May I assume you have the wires, but NOT the brake controller?

If so I will make an assumption here.. That is that Bargman makes the proper adapter.. For the TEKONSHA line of brake controllers.

Most of those connectors are off-the-shelf standard items by the way

NOTE: I have not verified what I'm about to post but another member here told me that the Teknosha controller can control the aux-brakes on my towed car.. I use a US-Gear system and he tells me the signals are standard electric brake signals.. Just so you know.

If you wish to tow 4-down. I'd give US-Gear a call and chat with customer support and verify that.

I DO NOT KNOW if their controller can do trailer brakes (But suspect not, higher current requirements)
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Old 10-13-2009, 11:33 AM   #5
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Quote:
Originally Posted by wa8yxm View Post
Describe or post a photo of the plug..

May I assume you have the wires, but NOT the brake controller?

If so I will make an assumption here.. That is that Bargman makes the proper adapter.. For the TEKONSHA line of brake controllers.

Most of those connectors are off-the-shelf standard items by the way

NOTE: I have not verified what I'm about to post but another member here told me that the Teknosha controller can control the aux-brakes on my towed car.. I use a US-Gear system and he tells me the signals are standard electric brake signals.. Just so you know.

If you wish to tow 4-down. I'd give US-Gear a call and chat with customer support and verify that.

I DO NOT KNOW if their controller can do trailer brakes (But suspect not, higher current requirements)
First
thanks for the honest info.
My coach has the standard 7 pin round with flat connectors inside, just like on my recently departed 350
i never thought about bargman adapters. I did read teknosha web site and no freightliner harness adapters, which i found odd.
I have checked the 7 pin out back and it has brake light feed, as well as turn and lights and + output.
the pin for brakes is there and according to the freightliner wiring schematic i read. the under dash connector is the place to plug in or tie in for sending an electric brake power to the trailer being towed.
four down towing for us is not going to be an occurrence very often probably not even this year.
so i have been working the issue for electric brakes
We are planning a very long trek next summer and the auto transport has won out for several reasons, that make me feel better(warm fuzzy) over this long haul.
thanks again for the insight, i will give bargman a look see

us gear has a nice controller as well but it seems to be designed for a towed vechicle vice a trailer. one would think..... that chassis builders would have as an option a built in controller for trailers and odd balls that like to have a trailer with toys on it
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Old 10-13-2009, 01:14 PM   #6
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I found this and it might be a very workable solution and can be swapped from trailer to trailer
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Old 10-13-2009, 01:46 PM   #7
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Quote:
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Tekonsha Website - 90250

I found this and it might be a very workable solution and can be swapped from trailer to trailer
RF brake controller? I'll bet it's expensive...
Rather than trying to find an adapter for the brake controller to your harness (by the dash)... May I suggest you run all new wiring for the controller. You will end up with another trailer plug at the rear end... but it is an alternative solution.

I did that for my brake controller cuz Winnie decided to install just a 6 way on my unit...Now I have a 6 way and a 7 way. Both with clean connections (not spliced) and I can power any kind of items being towed, whether it is my toad or my car trailer with elec brakes...
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Old 10-13-2009, 02:00 PM   #8
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Quote:
Originally Posted by LandHo View Post
RF brake controller? I'll bet it's expensive...
Rather than trying to find an adapter for the brake controller to your harness (by the dash)... May I suggest you run all new wiring for the controller. You will end up with another trailer plug at the rear end... but it is an alternative solution.

I did that for my brake controller cuz Winnie decided to install just a 6 way on my unit...Now I have a 6 way and a 7 way. Both with clean connections (not spliced) and I can power any kind of items being towed, whether it is my toad or my car trailer with elec brakes...
pricing appears to 350 ish
pretty pricey.
My plug in the harness under the dash is wired to the rear 7 pin plug, i have been reading all morning and two solutions are re-occuring
the rf controller and splicing the generic brake controller harness into the freightliner plug.
common sense would make one think....the adapter plug included by freightliner should be a common one, like a ford plug or a dodge plug.
the wires are there, why not use a common plug?
freightliner is owned by who again???? Daimler?? so use a Daimler plug?
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