electric trailer brake wiring at the axle - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-16-2008, 09:54 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 41
Posts: 5,156
Wiki Edits: 16

Thanks: 2
Thanked 5 Times in 5 Posts
electric trailer brake wiring at the axle

I just inherited a trailer that had the electric (drum) brakes disconnected. Its a dual axle trailer with brakes on both axles. Everything is wired, except the connection to the brakes themselves. The backing plates have two posts each, and some 8-guage wires going across the axles to the other side, then my 8-guage wire coming in from the connector

I know it has to go through the magnets, but there is no indication on the axles which is positive and which is negative. All I have are 8 lugs connected to each other with four wires.

Like this quick pic I drew:

The brown are the axles, and the wires are the colored lines. (not actual colors, just drawn that way for contrast) The black line is my brake power coming from the connector. The wires on the actual axles are brown, blue, black, and orange with a green stripe... so I think they can't be used as clues


    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-17-2008, 04:38 AM
Registered User
 

Last journal entry: T'Bird projectr
Last photo:
Join Date: Nov 2007
Location: Delton, MI
Posts: 209
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
It doesn't matter, the magnet doesn't care whether it's + or -, as long as current flows. Just wire 'em up, pick one to go to the brake pin in the plug, go to ground with the other. I've wired several vintage travel trailer brakes, both original and new axles under 'em, they'll work with 6 or 12v, + or - ground, no problems.

Brian

Oh, I'd wire them so all the magnets are wired the same way. Pick which post on each drum for your + (hot) wire, and just pull the wire from the forward drum (by that I mean the one the brake lead goes to, usually it'd be the left front)to the other three. 8 ga. is huge, I bought a new Dexter 7500lb axle for our last Spartan, which was wired with 14ga from the factory. I used 12ga to the plug, worked fine. This must be a really old trailer?

Last edited by flynbrian48; 07-17-2008 at 04:46 AM.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-17-2008, 06:13 AM
Marcel
 

Last journal entry: Choo-choo town
Last photo:
Join Date: Feb 2002
Location: adairsville ga.
Age: 71
Posts: 413
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
wiring an axle

I'd use a meter to ensure which termial is ground. jmtc
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-17-2008, 10:47 AM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 41
Posts: 5,156
Wiki Edits: 16

Thanks: 2
Thanked 5 Times in 5 Posts
Quote:
Originally Posted by flynbrian48
8 ga. is huge, I bought a new Dexter 7500lb axle for our last Spartan, which was wired with 14ga from the factory. I used 12ga to the plug, worked fine. This must be a really old trailer?
Actually its only 4 years old, but it has two 7000# axles and was homemade, so I guess the fabricator wanted to go overkill. I went with 8 ga because this is being towed behind a 24' box truck, so there is the potential for a 50' run of wire. I found 8 ga wire for 34 cents a foot and figured it can't hurt

Ok, so I'll just split my brake wire and go to the (let's say) front post on each brake of the one side. Then the existing wires on the axle will take voltage across. Same for the ground post; two wires from the rear posts to the frame. Sound good?
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
04 silverado trailer brake problem shady4 Electrical 2 05-17-2008 08:57 AM
Idiot Proofing My Trailer Wires Rob Keller Electrical 41 05-14-2007 07:32 AM
wiring diagram for brake light/indicator? pcoghlan Electrical 2 06-06-2006 02:58 PM
58 Chevy Apache : Brake Lights / Wiring Harness Rathimis Electrical 3 12-13-2005 08:34 AM
2000 nissan trailer wiring Dawger Electrical 3 08-15-2003 08:07 PM


All times are GMT -6. The time now is 10:27 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.