TrailManor Owner's Forum  

Go Back   TrailManor Owner's Forum > TrailManor Technical Discussions > Frame
Register FAQ Members List Calendar Mark Forums Read

Reply
 
Thread Tools Display Modes
Old 07-31-2021, 10:23 AM   #1
Casey Freswick
Senior Member
 
Join Date: Sep 2016
Location: Grand Rapids, MI
Posts: 204
Default Short in Brakes

I have a Primus IQ brake control unit. When I plug it in not connected to the trailer it says NC for no connection. When I connect the TM to the TV it says SH for a short in the system. I have disconnected the wires at the wheels. I have checked the wiring from the harness to the where the wires split to the two wheels. That wiring is good. (I connected the the positive wire at the split to another wire which I ran back to the trailer plug and tested continuity. There was no short in this wire. Same for negative). I then reconnected the wires to the drums: Short in System. Any suggestions?
__________________
Casey

TM: 2003 2720SL TV: 2014 Yukon


Casey Freswick is offline   Reply With Quote
Old 07-31-2021, 12:12 PM   #2
Larryjb
Site Sponsor
 
Join Date: Nov 2016
Location: Vancouver BC
Posts: 1,518
Default

Have the magnets in the trailer brakes worn through? I believe when they wear down to the windings they short.
__________________
Larry

2002 Tahoe
2008 4.6 Explorer
2001 2720SD

Various TM images that you may or may not find elsewhere:
http://www.trailmanorowners.com/forum/album.php?u=11700
Larryjb is offline   Reply With Quote
Old 07-31-2021, 01:37 PM   #3
Bill
Site Team
 
Bill's Avatar
 
Join Date: Feb 2003
Location: The mountains of Scottsdale, AZ, and the beaches of Maine
Posts: 10,088
Default

Quote:
I connected the the positive wire at the split to another wire which I ran back to the trailer plug and tested continuity. There was no short in this wire.
I'm not sure how testing a wire for contuity would show if the wire was shorted to ground. Perhaps I am misunderstanding.

Bill
__________________
2020 2720QS (aka 2720SL)
2014 Ford F-150 4WD 5.0L
Bill's Tech Stuff album
Bill is offline   Reply With Quote
Old 07-31-2021, 04:54 PM   #4
Casey Freswick
Senior Member
 
Join Date: Sep 2016
Location: Grand Rapids, MI
Posts: 204
Default

I may not be using the right terms. I checked the wire to make sure there was not a short in the wire. The wiring is good. So I assume the short was in the wiring into the brake or the electric brake itself. Checked out brakes on line. Camping world had 10 inch brake system for 38, regular 85. I have a store 4 minutes from my home. Picked it up and have the one of them on. Changing both. Will finish putting in new brake assembly Monday. Hope it all works when I am finished. Had one big problem. One of the studs started spinning. Ending up taking my electric grinder and grading off the head of the stud. A 3 minute job taking 60 minutes. It is the way it goes.
__________________
Casey

TM: 2003 2720SL TV: 2014 Yukon


Casey Freswick is offline   Reply With Quote
Old 08-01-2021, 05:55 AM   #5
Bill
Site Team
 
Bill's Avatar
 
Join Date: Feb 2003
Location: The mountains of Scottsdale, AZ, and the beaches of Maine
Posts: 10,088
Default

Quote:
Originally Posted by Casey Freswick View Post
I may not be using the right terms.
OK, I see.

The term "continuity" means that the wire is continuous from one end to the other. In other words, it is not broken or otherwise interrupted. A wire that does not have continuity is said to be "open".

The term "short" means that the wire has an unintended connection to some other wire or some other conductor. The term often, but not always, means an unintended connection to ground.

A wire with continuity (end-to-end) may be shorted somewhere along its length. A shorted wire (one that is touching ground somewhere along its length) may have continuity end-to-end.

When the brake controller tells you there is a short circuit, it is telling you that somewhere after the blue wire leaves the controller and heads for the brake magnet, somewhere along the way it is contacting ground. The short could be anywhere between the controller and the brake magnet. And since the wire in the magnet is basically an extension of the blue wire, the short could be at a spot where the insulation on the wire in the magnet has been worn away, allowing the magnet wire to touch the steel in the wheel. That is what Larry was referring to.

Hope this helps - I'm never sure.

Bill
__________________
2020 2720QS (aka 2720SL)
2014 Ford F-150 4WD 5.0L
Bill's Tech Stuff album
Bill is offline   Reply With Quote
Reply


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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Testing New Brakes Pater C Frame 12 02-26-2020 10:12 AM
Trailer Brakes hal General Maintenance and Cleaning 23 12-28-2010 02:18 PM
Just changed brakes and bearings -- why are the hubs so hot? ShrimpBurrito Frame 19 10-22-2008 01:32 PM
Brakes Grabbing zemmels Frame 10 07-03-2007 10:30 AM
Adjusting brakes hal Frame 5 07-20-2004 08:18 AM


All times are GMT -6. The time now is 08:09 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 2022 Trailmanor Owners Page.