RV.Net Open Roads Forum: Fifth-Wheels: 3 axle break controller issues

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Fifth-Wheels

Open Roads Forum  >  Fifth-Wheels

 > 3 axle break controller issues

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Sponsored By:
dkuntz

Colorado

Full Member

Joined: 02/03/2012

View Profile



Good Sam RV Club Member

Offline
Posted: 06/03/21 11:29am Link  |  Quote  |  Print  |  Notify Moderator

I have a 2019 Sierra HD with integrated brake controller. I'm towing a 5th wheel camper with two axles and electric brakes on each. Behind the camper I'm towing an ATV trailer with two axles, but only one of them has an electric brake. Towing either of the trailers individually there are no issues with the trucks brake controller to control the brakes on the trailer. But with both trailers connected the truck won't apply any 'juice' to the brakes. It does nothing - no brakes on their trailer. When I manually apply the brake controller it does nothing. GM is telling me the truck is only designed to handle two sets of electric brakes and if I want to handle 3, I would need to add an after market controller to control the 2nd trailer separately. I can understand not having a powerful enough controller, but does it make sense the trucks computer/controller would not apply any 'juice' to the brakes when it senses too much resistance via the 3 sets of brakes? Has anyone had this issue? How did you resolve?

I've never towed a 3 axle trailer before, but assuming all three of those axles have brakes don't they? How does the controller work in those instances?


2019 GMC Sierra 2500 Duramax, short bed
2020 Keystone Cougar Fifth Wheel 29MBS
Diamondback cover - Sided loaded
2017 Polaris Sportsman 450
2015 Polaris Sportsman 570 X2

Roger10378

Goodrich, MI.

Senior Member

Joined: 05/29/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 06/03/21 02:44pm Link  |  Quote  |  Print  |  Notify Moderator

You don't say how the brakes are wired to the second trailer so it is hard to know what is wrong but I think the problem is in the wiring between the two.

I can't think of any way that type of setup would work even if the controller would supply juice. There is no way that you could adjust a controller to supply the different amount of voltage that would give each set of brakes an appropriate amount of voltage. One would always give more brakes than the other. If you were to adjust it so that the 5er brakes give a decent amount of stopping power you would lock up the atv trailer or vice-versa.


2005 Cardinal 30TS
2007 Chevy 2500HD D/A

Mike134

Elgin, IL

Senior Member

Joined: 11/20/2019

View Profile


Offline
Posted: 06/03/21 02:59pm Link  |  Quote  |  Print  |  Notify Moderator

My guess the 3rd set of brakes draws too much current for your OEM controller.

https://www.hitchweb.com/blog/post/2012/02/21/testing-trailer-brake-magnets#:~:text=Testing%20Trailer%20Brake%20Magnets%20%20%207%22%20Brake,%20%20%20%203%20more%20rows%20


2019 F150 4X4 1903 payload
2018 Adventurer 21RBS 7700 GVWR.

ferndaleflyer

everywhere

Senior Member

Joined: 03/31/2011

View Profile


Offline
Posted: 06/03/21 06:39pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 3 axel trailer and the factory controller on my F-350 works perfect. It also worked on my previous 3500 Chev. That set up you discribe sounds like a disaster waiting to happen....and now brake problems?

KD4UPL

Swoope, VA

Senior Member

Joined: 03/16/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 06/03/21 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

I have no idea why your set up won't work but you don't want to do it like that anyway. You need a separate brake controller for each trailer. Use the built in for your first trailer and install an aftermarket one for your second trailer. You will need to adjust each independently to get everything to stop straight.

Incidentally, having more brakes connected does not increase the resistance (assuming you wired it properly) it will actually decrease the resistance causing the brakes to draw more current than what 2 brake axles would.

dkuntz

Colorado

Full Member

Joined: 02/03/2012

View Profile



Good Sam RV Club Member

Offline
Posted: 06/03/21 08:34pm Link  |  Quote  |  Print  |  Notify Moderator

Great input - I agree the 2nd controller makes sense now. I still don’t know why the truck is deciding to not send any voltage....not the best default if you ask me.

I tied into the 5th wheel wiring in the front compartment before it went into the under belly and then ran a new 7wire all the way to the back of the 5th that the ATV trailer then plugs into.

Thanks for the input!

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 

Open Roads Forum  >  Fifth-Wheels

 > 3 axle break controller issues
Search:   Advanced Search

Search only in Fifth-Wheels


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.