Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-05-2004, 08:29 AM   #1
1 Rivet Member
 
Join Date: Dec 2004
Posts: 5
more about electric brakes

I feel like a babe in the woods. I'm now able to tie the dead battery, the onboard charger always loaded,even if I thought everything was turned off,to the break away switch. Is this why all my brake magnets had a wire burnt off?I think with the pin pulled,there is always a feed to the brakes. duh! Harness is wired correct.
__________________

__________________
openroad is offline   Reply With Quote
Old 12-05-2004, 12:11 PM   #2
3 Rivet Member
 
71_safari's Avatar
 
Currently Looking...
West Linn , Oregon
Join Date: Apr 2004
Posts: 195
Images: 12
If you are saying that you were pulling the pin when parking the trailer - yes, it will create a constant draw, trying to hold the brakes on. I suppose it could eventually fry the wires. That pin is only for emergencies when the trailer gets loose, as you know. Interestingly, when I was last at the Airstream dealer in Eugene to have my brakes adjusted, the service advisor mentioned that a recent customer was also pulling the pin, and always had a dead battery in the morning. Apparently this is something that has not been explained to folks well enough.
__________________

__________________
Currently living in SE Asia
1971 Safari 23 (sold)
71_safari is offline   Reply With Quote
Old 12-05-2004, 12:50 PM   #3
Well Preserved

 
1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,189
Even worse, if you do this, it is very possible to burn up the magnets in the brakes, also. One of these threads contains a post from Andy at Inland (Ithink) that states you shouldn't leave the pin pulled out on your breakaway switch for more than a couple of minutes at most, or you may fry the electric part of the magnets.

Terry
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 12-05-2004, 01:21 PM   #4
Retired Moderator
 
john hd's Avatar
 
1992 29' Excella
madison , Wisconsin
Join Date: Aug 2002
Posts: 4,644
Images: 40
and detemper the spindles on your axles!!!

john
__________________
you call them ferrets, i call them weasels.
john hd is offline   Reply With Quote
Old 12-05-2004, 07:52 PM   #5
Rivet Master<br><img src="/ugala/forums/images/5rivet.gif">
 
CanoeStream's Avatar

 
2006 25' Safari FB SE
St. Cloud , Minnesota
Join Date: Aug 2003
Posts: 13,279
Images: 19
Blog Entries: 3
A good thread: Breakaway switch

All learning curves are uphill, ain't they? Been there -- am still there. Welcome to ASForums and come back often! No question is 'too smart.'
__________________
Bob

5 meter Langford Nahanni

CanoeStream is offline   Reply With Quote
Old 12-16-2004, 11:52 AM   #6
1 Rivet Member
 
Join Date: Dec 2004
Posts: 5
electric brake wiring?

after the feed comes onto the yellow wire from my brake controller,where does it go?I'm assuming it gets to the magnets in all the wheels to apply the brakes. I also think a fully charged battery in the trailer puts a feed to the magnets if the pin on the breakaway is pulled.what I can,t understand is how this circuit is wired. My electrical diagram in the airstream book does not dig this deep.Does anyone have this info? I would be grateful.
__________________
openroad is offline   Reply With Quote
Old 12-16-2004, 12:18 PM   #7
Rivet Master
 
87MH's Avatar
 
1978 31' Sovereign
Texas Airstream Harbor , Zavalla, in the Deep East Texas Piney Woods on Lake Sam Rayburn
Join Date: Jan 2003
Posts: 2,435
Images: 292
Quote:
Originally Posted by openroad
......after the feed comes onto the yellow wire from my brake controller,where does it go?
I have just "opened up" the front interior of the '78 Sovereign, and this is what I have found....The yellow wire from the Brake Controller ties into a black wire, which is paired to a white wire from the "ground" bus in the fuse/battery box. These two wires run in a "red" sheath to the underbelly and then ultimately to the brake magnets at the wheels.

Now, where the "yellow" Brake Controller wire (+/- 6 volts) ties into the "black" wire, there is a third wire, "blue" in my case, that ties into the same crimp connection. This blue wire comes from the "break-away" switch at the hitch. The "blue" wire gets its power (voltage) (when it is closed or "activated") from the same wire (red) that supplies power to the electric tongue jack.

What this means is that when the "break-away" switch is activated, full (trailer) battery voltage (12 volts +) is sent to the brakes.....this is more or less a direct short connection via the brake magnets. This "short" will either deplete a battery or burn a wire (or magnet) in short order.

The (red) wire to the electric jack is protected by a 30 amp (I think) breaker, so there is plenty of basically unprotected "juice" flowing to the brake magnets when the break-away switch is closed. The breaker protecting the jack is visible when you remove the inner cover of the 12 volt fuse box. On the extreme right hand side (on the '78, anyway) will be two breakers, the upper breaker is connected to the feed (blue wire) from the charging circuit of the Tow Vehicle, and the lower (connected to the red wire) is the breaker protecting the Electric Jack/Break-Away circuit.
__________________
Dennis

"Suck it up, spend the bucks, do it right the first time."

WBCCI # 1113
AirForums #1737

Trailer '78 31' Sovereign

Living Large at an Airstream Park on the Largest Lake Totally Contained in Texas
Texas Airstream Harbor, Inc.
87MH is offline   Reply With Quote
Old 12-16-2004, 01:49 PM   #8
BAUXITE
 
Ed Keyes's Avatar
 
2004 25' Classic
homosassa , Florida
Join Date: Aug 2003
Posts: 50
Electric brakes

Have a Hensley Hitch and on occasiond found it is helpful to pull the pin when I am taking the hitch bar from the hitch box. Even when I jack the trailer to what I consider the ideal height, in some situations the truck wants to drag the trailer even though the wheels are blocked. I replace the pin as soon as hitch bar has cleared.
__________________
Ed Keyes is offline   Reply With Quote
Old 12-16-2004, 06:28 PM   #9
Rivet Master
 
Over59's Avatar
 
1959 26' Overlander
Putnam , Connecticut
Join Date: Sep 2003
Posts: 3,064
Images: 37
I'm not sure what problem you are trying to solve. A wire (mine is red on the 68) is attached to that breakaway switch. The switch is bolted to the frame. When the pin is in the circuit is held open. When pulled out the circuit is closed and the magnet energize. The magnet already has a 12v load on it. If the controller or the switch connects the mag to ground then the brakes go off. The load (juice) if from the common bus which connects the battery bank and tow veh charge line.


Now I belief this to be true but a confirmation from the forum EE would be welcomed.
__________________
Over59 is offline   Reply With Quote
Old 12-16-2004, 08:44 PM   #10
Retired Moderator
 
john hd's Avatar
 
1992 29' Excella
madison , Wisconsin
Join Date: Aug 2002
Posts: 4,644
Images: 40
i'll see if i can come up with a diagram and explanation later...

i just got home from work at the power company had to deal with a transformer full of RATS! and gnawed off wires!!

i have to go drink some beer and go wash the rat cooties off me!!

i'll get back, pm me if i ferget!

john
__________________
you call them ferrets, i call them weasels.
john hd is offline   Reply With Quote
Old 12-17-2004, 09:22 AM   #11
1 Rivet Member
 
Join Date: Dec 2004
Posts: 5
thanks for all the input to my wiring electric brakes questions. I think in my 69 vintage it used two wires ,to the breakaway switch. also a black and white to each wheel magnet are probably joined to the yellow(brake) wire,and also to the breakaway switch.
__________________
openroad is offline   Reply With Quote
Old 12-17-2004, 10:45 PM   #12
Retired Moderator
 
john hd's Avatar
 
1992 29' Excella
madison , Wisconsin
Join Date: Aug 2002
Posts: 4,644
Images: 40
ok,

here are some diagrams that may help somewhat.

john
Attached Thumbnails
Click image for larger version

Name:	bc_wirediagram.gif
Views:	523
Size:	47.2 KB
ID:	9766  
__________________
you call them ferrets, i call them weasels.
john hd is offline   Reply With Quote
Old 12-17-2004, 10:50 PM   #13
Retired Moderator
 
john hd's Avatar
 
1992 29' Excella
madison , Wisconsin
Join Date: Aug 2002
Posts: 4,644
Images: 40
and the trailer
Attached Thumbnails
Click image for larger version

Name:	breakaway.jpg
Views:	238
Size:	50.9 KB
ID:	9767  
__________________
you call them ferrets, i call them weasels.
john hd is offline   Reply With Quote
Old 01-03-2005, 12:28 AM   #14
4 Rivet Member
 
greg176's Avatar
 
1961 26' Overlander
Gabriola Island , British Columbia
Join Date: Aug 2003
Posts: 474
Images: 1
Just a note on what I have been reading about breakaway systems.Tekonsha sells a 4 amp hour battery and charger for the trailer power source.Perhaps if this was used instead of the trailer's deep cycle battery an accidental pulling of the pin would not result in burnt magnets,wiring and toasted spindles.
__________________

__________________
greg176 is offline   Reply With Quote
Reply


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
Grabbing Brakes 74Tradewind Brakes & Brake Controllers 15 08-05-2004 06:26 PM
problem with Brakes jazzbone Brakes & Brake Controllers 33 08-23-2002 08:05 AM
Disc Brakes? J.Hemingway Brakes & Brake Controllers 2 08-22-2002 08:56 PM
Heeeelp! My brakes have failed...anyone have a similar experience? williamhenshall Airstream Motorhome Forums 9 07-12-2002 04:04 PM
conversion from vacuum/disk to electric brakes excelladep Brakes & Brake Controllers 2 05-30-2002 12:54 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:55 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.