Thread Tools Search this Thread Display Modes
Old 10-22-2002, 05:48 PM   #1
New Member
Join Date: Oct 2002
Posts: 2
Post Low Voltage Problem

I have a 1974 Soverign 31' airstream. How do I go about troubleshooting a 12V low voltage problem? With the trailer connected to commercial power, a fully charged battery will completely discharge over night. The 110V circuits still work okay. I do not own a maintenance manual for this trailer. Any suggestions are greatly appreciated.

kellyw is offline   Reply With Quote
Old 10-22-2002, 05:52 PM   #2
Retired Moderator
john hd's Avatar
1992 29' Excella
madison , Wisconsin
Join Date: Aug 2002
Posts: 4,644
Images: 40
do you hear any humming from the univolt unit when you plug the trailer in?


john hd is offline   Reply With Quote
Old 10-22-2002, 10:29 PM   #3
4 Rivet Member
Join Date: Feb 2002
Posts: 334
Images: 3
Discharged battery

To determine if a battery is being discharged, first the battery must be checked to determine battery condition. A battery is fully charged when the voltage is measured with a digital volt meter and the voltage is 12.6 or 12.7 volts. If a battery is 12.0 volts the battery is 75% discharged.
An easy way to determine what 12volt circuit is using power is to remove all fuses from their holders. Before removing fuses, note their position as to amps. Indivually replace one fuse at a time and note any sparking as fuse is installed. Nope the 12 volts will not shock or harm any human. If no sparks are noticed. check battery and disconnect the ground cable untill some 12-15 hours have passed. Then again check battery voltage. If possible make all the checks with the 120 volt ac not connected. NO shore power. Depending on results of tests, more checking maybe required.
Attached Thumbnails
Click image for larger version

Name:	ford rewire.jpg
Views:	227
Size:	56.4 KB
ID:	709  
Visit Idaho The people are great
FrankR is offline   Reply With Quote
Old 10-23-2002, 06:35 PM   #4
New Member
Join Date: Oct 2002
Posts: 2

To john hd: I did not notice any humming from the univolt unit when you plug the trailer in.

To FrankR: Thanks for your help. I suspect my problem may be in circuit#4. How can I find out what area of the trailer is serviced by circuit#4? The reason I suspect this circuit is because the ohms reading across the positive and negative battery connectors (with the battery disconnected) is close to a short until I pull out the fuse for circuit#4. I will try what you suggested, however it will be awhile before I get back down to the trailer to check it out.

Thanks for the help,
kellyw 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
12v problem Chuck Electrical - Systems, Generators, Batteries & Solar 18 10-08-2003 11:15 AM
electrical problem kent osborn 1966 - 1968 Safari 3 09-27-2003 05:30 AM
Voltage Regulator Rayk Airstream Motorhome Forums 2 09-16-2003 06:36 PM
Low water pressure in Excella murf Fresh Water Systems 7 09-04-2002 07:12 AM
Electrical problem resolved davidz71 Electrical - Systems, Generators, Batteries & Solar 5 08-12-2002 08:21 PM

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 04:41 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.

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