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

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  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 08-17-2013, 05:05 PM   #1
DougL3NC's Avatar
Join Date: Aug 2013
Location: China Grove, NC
Posts: 70
4 flat to 7 pin converter

My truck has the 4 flat connector and naturally the TT has the 7 pin. Will I run into any issues using an adapter?

If so, what can I do to correct my problem?

Thanks in advance,


DougL3NC 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 08-17-2013, 05:08 PM   #2
Senior Member
Ramblin's Avatar
National RV Owners Club
Workhorse Chassis Owner
Ford Super Duty Owner
Carolina Campers
Join Date: Aug 2011
Posts: 2,250
4 flat is only going to handle lights. Does your TT have brakes?

2002 National Dolphin LX 6356
Workhorse W-22 chassis
Don't believe everything you think.
Ramblin is offline   Reply With Quote
Old 08-17-2013, 05:55 PM   #3
Moderator Emeritus
TXiceman's Avatar

Vintage RV Owners Club
Texas Boomers Club
Oklahoma Boomers Club
Ford Super Duty Owner
Join Date: Aug 2000
Location: Full Time, TX Home Base
Posts: 17,139
Blog Entries: 21
The 7 pin adds brakes, possibly back up lights and a charge line from the tow vehicle. You need to get a proper 7 pin plug wired for the vehicle.

Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
TXiceman is offline   Reply With Quote
Old 08-17-2013, 05:58 PM   #4
Senior Member
Join Date: Jun 2011
Location: Olivehurst, CA
Posts: 498
You need to put a 7 pin receptacle on the TV(tow vehicle) and wire the additional circuits into the TV. As the response above stated the 4 pin flat only handles ground, left brake/turn, right brake/ turn and tail lights. Most RV plugs have the same four circuits as the four pin flat as well as a circuit for the electric brakes, a 12vdc hot wire to charge the battery on the TT and an additional circuit for additional options. You will need to add a brake controller in the TV as well, so you can control the brakes on the TT.
Winnebeater is offline   Reply With Quote
Old 08-22-2013, 05:39 PM   #5
Moderator Emeritus
SmokeyWren's Avatar

Join Date: Jun 2011
Location: Midland County, Texas
Posts: 2,754
An adapter won't work to give you 7-pin functionality. Instead you need at least three things:

1) A 7-pin wiring harness and plug made to fit your year/model of tow vehicle. You can get that at
Trailer Wiring | etrailer.com
or other trailer parts supplier. Also the parts department at the dealership for your truck brand probably has what you need in stock.

2) A trailer brake controller installed and wired into your truck. Best is probably the factory integrated trailer brake controller (ITBC) made for your exact truck, but less expensive aftermarket brake controllers are also available.

3) Fuses and relays added to the truck's power distribution box and/or fuse box.

Unless you are good with wiring automotive electrical stuff, then best is probably to have a good RV dealer or trailer retailer install the wiring harness and brake controller with required fuses and relays.
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 EcoBoost SuperCrew.
SmokeyWren is offline   Reply With Quote
Old 08-22-2013, 06:59 PM   #6
DougL3NC's Avatar
Join Date: Aug 2013
Location: China Grove, NC
Posts: 70
Thanks guys! Got the Reese kit that has all the fuses, relays, and correct 7 pin harness. Also bought the harness to plug in under the dash for the brake controller. All from etrailer.com!

DougL3NC is offline   Reply With Quote

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

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:04 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.