Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-19-2014, 05:12 PM   #1
Rivet Master
 
KJRitchie's Avatar

 
2008 25' Classic
Wichita Falls , Texas
Join Date: Nov 2012
Posts: 4,222
How to Test if Trailer Battery is Getting Charged from Tow Vehicle

How do I confirm the battery is getting a charge when plugged into my tow vehicle? I have 13.6v on the pin on my tow vehicles 7 pin connector. Where can I put my volt meter to test if the battery is getting charged. I don't see the 13.6v at the battery when connected. Where does the power wire from the 7 pin connector terminate on a late model airstream. I see a bundle of cables coming up through the floor under the bed of my Classic FB. Does that pin wire go to the converter on the other side of the bed or terminate somewhere around the Use/Store relay?

I'm concerned because I had the AS connected to shore power for two days and drove home from the campground and the voltage of the batteries was showing 12.4v. I was expecting 12.8v after only less than an hours drive from home.

Kelvin
__________________

__________________
KJRitchie is offline   Reply With Quote
Old 10-19-2014, 07:46 PM   #2
Rivet Master
 
Skater's Avatar
 
1995 30' Excella
Bowie , Maryland
Join Date: Apr 2005
Posts: 2,344
One thing to check: use a multimeter or test light to look for power at the +12 volt line on the trailer's connector while disconnected from the truck. If it has 12 volts there, it's wired into your trailer's 12 volt system and thus should be charging while you are towing.

Note the vehicle doesn't supply much power to actually charge. Still that seems like quite a drain on a short time.
__________________

__________________
1995 Airstream Classic 30' Excella 1000
2014 Ram 2500 Crew Cab with Cummins 6.7L Diesel

Sold but not forgotten: 1991 Airstream B190
Sold: 2006 F-250 6.0L Powerstroke Supercab
Skater is offline   Reply With Quote
Old 10-19-2014, 08:08 PM   #3
GAT
Owner Spirit of "76"
 
GAT's Avatar
 
1976 31' Sovereign
Ball Ground , Georgia
Join Date: Aug 2010
Posts: 271
I am dealing with the same concern except in a 1976. At the fuse panel there is a blue wire labeled vehicle that looks like it powers a buss that ties the converter, battery, and vehicle together. Is there any thing in the housing covering the chassis plug that may cut power. I would have to pull the Groucho out to find out.any suggestions.
__________________
A husband is the biggest baby you will have and take the most adult supervision.

Gene and Elaine Thomason
Ball Ground Ga.
1976 31 foot Sovereign
2011 GMC 2500HD Denali
6.6 Duramax Diesel
GAT is offline   Reply With Quote
Old 10-19-2014, 08:20 PM   #4
Rivet Master
 
KJRitchie's Avatar

 
2008 25' Classic
Wichita Falls , Texas
Join Date: Nov 2012
Posts: 4,222
I just checked the tailer connection with the batteries connected and the Use/Store switch set to on and I don't see any voltage on the 12v trailer connector. I checked all the connectors.

OK, so where does the 12v wire, I think black, from the 7 pin connector cable connect into the trailer? Below the Use/Store relay is a bus bar that is upstream of the relay so even if its in Store mode the bus bar has 12v.

Is there a fuse on the 12v line from the tow vehicle?

Thanks for any help.

Kelvin
__________________
KJRitchie is offline   Reply With Quote
Old 10-19-2014, 09:56 PM   #5
Rivet Master
 
kscherzi's Avatar
 
2013 27' FB International
El Dorado Hills , California
Join Date: Jan 2013
Posts: 1,137
Images: 24
A friend of mine said it's common for automakers to not connect the 12 volt supply to their 7 pin connector. His recent model Chevy 2500 wasn't connected. He wired it himself.
__________________
kscherzi is offline   Reply With Quote
Old 10-19-2014, 10:08 PM   #6
4 Rivet Member
 
drew05's Avatar
 
2011 25' FB Flying Cloud
Peculiar , Missouri
Join Date: Aug 2010
Posts: 488
Are you getting 12v from your truck? Check Pins 1 & 4, these are your 12v. Check with both the ignition on and off. I found my 30 amp fuse had blown.

Good Luck
__________________
drew05 is offline   Reply With Quote
Old 10-19-2014, 10:44 PM   #7
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,140
Images: 2
Blog Entries: 5
Check the voltage at the battery itself. With the TV connected and running above idle speed. It should be north of 13 volts if the battery is being charged.
The alternator of the TV puts out about 14.6 volts when the regulator calls for max output.


Sent from my iPod touch using Airstream Forums
__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 10-19-2014, 11:17 PM   #8
Rivet Master
 
KJRitchie's Avatar

 
2008 25' Classic
Wichita Falls , Texas
Join Date: Nov 2012
Posts: 4,222
With the tow vehicle running the batteries still show under 13v. However as I let the Tundra idle I noticed the battery voltage increase a little from 12.6 to 12.73. The power pin on my Tundra connector is showing 13.6v. There is no issue with the taillights or running lights. If I knew where the power lead of the trailers connector was terminated in the AS I could test there and if there is a break in the cable then I can get that harness replaced. There are so many wires around the Store/Use relay and they are bundled together its hard to trace. I don't see a black wire split off from that loom going forward to the converter. Is there a fuse on this line and if there is where is it.

There is a black box next to the Store/Use relay that has several color coded wires. I found this on youTube that describes the electrical system and about 10:30 minutes in the tech describes this is where the 7 connector cable connects. I'll check it out tomorrow on mine.

__________________
KJRitchie is offline   Reply With Quote
Old 10-20-2014, 10:24 AM   #9
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,140
Images: 2
Blog Entries: 5
Did you have the Store/Use switch in the Use position? It would make sense to me that it would be in the Use position when you are towing.
The TV charge line will be wired in parallel with the converter. An educated guess is there will be a 30 amp (or so) fuse in the fuse panel. It should be labeled. TV charge line or something like that.
If you post a pic of the fuse panel. Maybe we can help.


Sent from my iPod touch using Airstream Forums
__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 10-20-2014, 10:56 AM   #10
Rivet Master
 
KJRitchie's Avatar

 
2008 25' Classic
Wichita Falls , Texas
Join Date: Nov 2012
Posts: 4,222
There is a photo of my DC fuse panel here in post 37 on this thread

http://www.airforums.com/forums/f449...ml#post1298057

This is the fuse panel from the Progressive PD4655 that I upgraded last year from the Parallax converter. I moved the wires over from the Parallax fuse panel to the Progressive panel one at a time. Supposedly if a fuse blows it illuminates and LED on the panel.

According to the youTube video, posted in 2011, the 7 way tow vehicle/trailer connector terminates to the Bargman 7 way junction box next to the Use/Store switch under my front bed behind a removable enclosure. I did have the Use/Store switch on when I performed the last test. I would be hard to imagine a break in the 12v wire within the 7 way sheathed cord. If I can just ID the termination point then I can determine if the 13.6 volts from the tow vehicle 7 pin connector is getting to the trailer electrical system.

Kelvin
__________________
KJRitchie is offline   Reply With Quote
Old 10-20-2014, 11:10 AM   #11
Rivet Master
 
HowieE's Avatar
 
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,814
Images: 12
You mention that you are reading 13.6 at the 7 pin on the truck. I assume that is with the trailer disconnected and if so is an open circuit reading. Disconnect the positive terminal on the battery, connect the trailer to the truck, run the truck off idle, and measure the voltage from the positive battery cable to trailer ground. That should be the same open circuit voltage you read at the 7 pin less a bit for line loss. If so the truck charging is getting to the trailer. Keep in mind that the wire is small and will not deliver the same charging current that goes to the truck batteries.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 10-20-2014, 11:51 AM   #12
Rivet Master
 
KJRitchie's Avatar

 
2008 25' Classic
Wichita Falls , Texas
Join Date: Nov 2012
Posts: 4,222
I did try this test but took the positive an negative wires off the batteries and then put my volt meter on the each of the battery cable ends and read nothing while the trailer was connected to the TV. I'll try leaving the negative attached to the batteries with the positive off today after work. Thanks

Kelvin
__________________
KJRitchie is offline   Reply With Quote
Old 10-20-2014, 01:09 PM   #13
Rivet Master
 
HowieE's Avatar
 
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,814
Images: 12
If you read nothing between the 2 cables it sounds like you have an open in one of the cables.

If you know how to test continuity with your meter I would test the cables for continuity to the umbilical cord. The ground pin should show continuity to the frame and the neg. battery cable. The battery pin should show continuity to the positive battery cable.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 10-20-2014, 02:01 PM   #14
Rivet Master
 
KJRitchie's Avatar

 
2008 25' Classic
Wichita Falls , Texas
Join Date: Nov 2012
Posts: 4,222
My meter has an Ohm setting. So if I put the positive meter lead on the 12v pin of the connector and the negative on the positive I should read 0 ohms. The same if I put the positive meter lead on the neutral pin of the connector and the negative on the negative battery and/or the frame. If I don't read 0 ohms on either then does that mean my trailer cord needs to be replaced?

I've sent an email to Airstream to send me a wiring diagram and what troubleshooting procedure they recommend.

Kelvin
__________________

__________________
KJRitchie 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
Trailer Battery doesn't stay charged morrowtimber Batteries, Univolts, Converters & Inverters 12 03-20-2011 11:53 AM
Battery Charged but Electric Items Only Working When Plugged in..help?!?!. ericwarren Our Community 12 05-07-2009 09:24 AM
Battery's gurgling while being charged? Kistler Batteries, Univolts, Converters & Inverters 4 11-16-2004 12:05 PM
Can't get batteries charged -- why not? neil.ervin Batteries, Univolts, Converters & Inverters 23 11-14-2004 08:24 PM
Electrically Charged Trailer - Help! Joe Z Electrical - Systems, Generators, Batteries & Solar 40 10-12-2004 12:04 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:44 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.