Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > Trailer Towing and Tow Vehicles Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 02-10-2021, 09:24 AM   #1
Junior Member
 
Join Date: Feb 2021
Posts: 4
Question 7-pin harness vs 4-pin with adapter

Good morning, I am brand new to the forum and to RVing itself. I have been camping in the last few years and in the last two of them my friends have been "using" our friends' travel trailer and this year we are planning to start to get into it ourselves - probably just renting a few models before we think we are good to make the jump into getting our own.

A big step in that direction was the purchase of a car that pulls a small travel trailer, i.e. a 2021 Kia Telluride. The harness that Kia Canada sells on their website and through their dealers is a 4-pin, and as far as my friend could explain to me, that one does not pass on the brake signal to the trailer as a 7-pin harness would.

I found a website that apparently shows a Kia OEM part that is a 7-pin but my dealer says it's an American part and they don't have experience installing it; they said they would install the 4-pin and a 4-to-7-pin adapter. I've seen people on Telluride forums talking about it, and showing a part that goes on the back of the car, but in my mind it doesn't make sense, how can the brake signal be sent if the brake signal from the car is not being plugged by the initial 4-pin harness? My friend doesn't know as well.

Sorry if this is a very basic question, I'm trying to do research on my own but I can't seem to understand how it works.
ColinZeal is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 02-10-2021, 09:37 AM   #2
Senior Member
 
Join Date: Oct 2015
Location: Washington
Posts: 1,498
In any system you want to connect you have to send the right signals.

Here is the standard wiring configuration:


No standard 4 pin connect carries braking control, just lighting control.

Many small trailers may not even come with brakes, other will come with surge brakes which is built into the hitch and a few will come with electric brakes.

If you have a trailer that has electric brakes, you need a brake controller which is wired like:


So before you start wiring stuff, you really need to know what kind of brakes the trailer(s) you will be puling have.
__________________
2014 Volvo 630 Tandem 2016 Chevy 3500 DRW, crew cab
2016 Fuzion 325T
675ah AGM, MSH 3012 inverter, 1400w Solar
Nwcid is online now   Reply With Quote
Old 02-10-2021, 09:42 AM   #3
Senior Member
 
TonyMac's Avatar
 
Monaco Owners Club
Join Date: Oct 2014
Location: Idaho Falls, Idaho
Posts: 3,677
If your tow vehicle already has a 4 pin installed, the 4-7 pin adapter allows the 4 pin to be plugged into the adapter, and now you just have to add the other wires you might need, likely a brake signal and a battery charge line. If you don't have the 4 pin already installed, the adapter is a waste, just buy a 7 pin and wire the lights, ground, brake and power to it.
__________________
Cheers,
TonyMac
2006 Monaco Safari Cheetah 40PMT
TonyMac is offline   Reply With Quote
Old 02-10-2021, 10:15 AM   #4
Junior Member
 
Join Date: Feb 2021
Posts: 4
Yeah, I'm asking another dealer if they have more experience with that. Don't want people mixing up wires. Thank you.
ColinZeal is offline   Reply With Quote
Old 02-10-2021, 10:43 AM   #5
Senior Member
 
Old-Biscuit's Avatar
 
Join Date: Nov 2015
Posts: 21,636
2021 Kia Telluride brochure shows a 5000# tow capacity which in the real world means 3500# GVWR trailer

If your 2021 Kia Telluride doesn't have any 'tow package' ----trans cooler, wiring for brake controller, trailer wiring harness etc

Then you will have to have power, turn signal/brake light, braking, charge line wiring---fuses installed along with 7 pin receptacle/brake controller

The owners manual should have 'towing information' and fuse locations for trailer connections **If equipped


NWCID's post #2 includes LOTS of GOOD information/wiring
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor & NUWA 5vr
US NAVY---USS Decatur DDG-31
Old-Biscuit is online now   Reply With Quote
Old 02-10-2021, 11:59 AM   #6
Senior Member
 
Join Date: Apr 2003
Location: Kelowna, B.C. Canada
Posts: 1,414
In case you haven't read this already; https://www.kiatelluride.org/threads...r-towing.1298/

Dave
__________________
2022 Outdoors RV 25RDS, 2003 Dodge 3500 dually, Cummins, 6 spd.
Dave Pelletier is offline   Reply With Quote
Old 02-10-2021, 03:38 PM   #7
Junior Member
 
Join Date: Feb 2021
Posts: 4
Quote:
Originally Posted by Dave Pelletier View Post
In case you haven't read this already; https://www.kiatelluride.org/threads...r-towing.1298/

Dave
Yes, I am on that forum as well. Thank you.
ColinZeal is offline   Reply With Quote
Old 02-10-2021, 04:06 PM   #8
Member
 
lwbfl's Avatar
 
Join Date: Jun 2006
Location: Florida Panhandle
Posts: 67
Or look into trailers with surge brakes!
__________________
2021 Coachmen Apex Ultra Lite 253RLS
lwbfl is offline   Reply With Quote
Old 02-13-2021, 01:11 PM   #9
Senior Member
 
Join Date: Dec 2012
Location: Swoope, VA
Posts: 326
Did your vehicle come with a built in trailer brake control? I'm assuming not so you will need one. You might consider going to a good trailer dealership that can not only sell and install the brake controller but will likely know far more about the correct wiring harness than a KIA dealer. In addition to your factory 4 pin you will need to add a heavy gauge battery charge wire and the appropriate wires for the brake control. It's unlikely that any of this is present on your vehicle.
__________________
2005 Chevy CC Dually D/A, 2009 2500 Suburban, 2004 Rinker Captiva 232 boat
KD4UPL is offline   Reply With Quote
Old 02-14-2021, 08:04 AM   #10
Junior Member
 
Join Date: Feb 2021
Posts: 4
Quote:
Originally Posted by lwbfl View Post
Or look into trailers with surge brakes!
Yeah I looked into those, also those wireless ones and the Bluetooth ones, they have their advantages but in the end I would rather have my car's brake pedal to work together with the trailer brake pedal. But it is a very attractive option due to the commodity of installation.

Quote:
Originally Posted by KD4UPL View Post
Did your vehicle come with a built in trailer brake control? I'm assuming not so you will need one. You might consider going to a good trailer dealership that can not only sell and install the brake controller but will likely know far more about the correct wiring harness than a KIA dealer. In addition to your factory 4 pin you will need to add a heavy gauge battery charge wire and the appropriate wires for the brake control. It's unlikely that any of this is present on your vehicle.
Yeah right now I will check around in Kia dealerships for any that have that experience, because I would like to have someone who knows the car to deal with it. I've seen on that Telluride forum some that did it in their dealerships so I know they exist. Next best option is as you said a trailer dealership.
ColinZeal is offline   Reply With Quote
Reply

Tags
ada



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
BlueFire 9-Pin J1939/J1708 Green Connector Bluetooth Android/Windows Adapter dmctlc Cummins Engines 0 07-09-2020 01:57 PM
Tekonsha wire harness adapter Erlingiii Class A Motorhome Discussions 8 02-14-2017 01:02 PM
Trailer lights 7 pin adapter Hawk43 Freightliner Motorhome Chassis Forum 3 07-24-2016 07:40 AM
Question: Electric Brake Harness adapter TenBear Toads and Motorhome Related Towing 0 04-19-2010 03:01 PM
4 pin harness zetron Toads and Motorhome Related Towing 15 05-07-2005 06:48 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 01:22 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.