RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-02-2020, 08:30 PM   #1
2 Rivet Member
 
2021 27' Flying Cloud
Salado , Texas
Join Date: Sep 2020
Posts: 39
7 pin charging

Looking for some group wisdom, when plugged in to my truck using the 7 pin connector, the airstream has a dedicated 12v 30a fused pin. Will that pin charge the batteries while my truck is running?

Thanks,
Gtx Eng is offline   Reply With Quote
Old 12-02-2020, 10:07 PM   #2
Rivet Master
 
SSquared's Avatar
 
2013 25' FB Flying Cloud
Longmont , Colorado
Join Date: Jan 2012
Posts: 839
In general, yes.



The "howevers" are

1) some tow vehicles come from the factory without the fuse installed in the circuit.

2) I believe there are some years/models of Airstream where the batteries only charge when the "use/store" switch is set to "use". But most people always have their switch in "use" when they are traveling anyway.
SSquared is offline   Reply With Quote
Old 12-02-2020, 10:24 PM   #3
Rivet Master
 
2017 23' Flying Cloud
Bartlett , Tennessee
Join Date: Apr 2017
Posts: 704
Quote:
Originally Posted by SSquared View Post
In general, yes.



The "howevers" are

1) some tow vehicles come from the factory without the fuse installed in the circuit.
If I am not mistaken, (I often am), it is the General Motors vehicles that need the fuse inserted.
__________________
Bobbo and Lin
2017 F-150 XLT 4x4 SuperCab 3.5l EcoBoost V6
2017 Flying Cloud 23FB "BobLin Along"
Bobbo is offline   Reply With Quote
Old 12-03-2020, 05:56 AM   #4
2 Rivet Member
 
2021 27' Flying Cloud
Salado , Texas
Join Date: Sep 2020
Posts: 39
Thanks guys - appreciate the help.
Gtx Eng is offline   Reply With Quote
Old 12-03-2020, 07:25 AM   #5
Rivet Master
 
1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
Join Date: Oct 2010
Posts: 3,752
Blog Entries: 1
Even with the fuse in place I think the answer is a big maybe. It depends upon the charging system and the wiring. On our truck we get very little power added to trailer batteries that are low even if we tow all day. If you really want to charge the batteries while towing I think you should look at adding a DC to DC converter to the trailer for that purpose. Try it like it is first and see if it really does charge the batteries.
Bill M. is offline   Reply With Quote
Old 12-03-2020, 07:32 AM   #6
Rivet Master
 
lsbrodsky's Avatar

 
2012 25' FB International
Trent Woods , North Carolina
Join Date: May 2013
Posts: 3,047
Everything above I agree with, but for a little more detail as to why this is iffy:
The wire used by the truck OEM is not big enough to carry a lot of current, but it will provide for modest charging. Your truck's charging system brain can drop alternator output so that the alternator output, minus the voltage drop across the long wire run from the alternator to your trailer battery results in almost no charging.
However, Tow Haul, at least on GM trucks(only ones I have experience with) keeps the voltage up at charging level and I do see charging even on my Lithium cells.
Larry
lsbrodsky is online now   Reply With Quote
Old 12-04-2020, 04:59 AM   #7
2 Rivet Member
 
2021 27' Flying Cloud
Salado , Texas
Join Date: Sep 2020
Posts: 39
I have a towing package on my 2500 Ram and will see how it works. I'll report back to the thread with my findings.
Gtx Eng is offline   Reply With Quote
Old 12-04-2020, 07:18 AM   #8
JDG
Riveted
 
JDG's Avatar
 
2018 33' Classic
Charleston , West Virginia
Join Date: Mar 2018
Posts: 153
If you have a solar package installed on your coach would the batteries not charge via solar while traveling (day travel)?
JDG is offline   Reply With Quote
Old 12-07-2020, 06:42 PM   #9
2 Rivet Member
 
2021 27' Flying Cloud
Salado , Texas
Join Date: Sep 2020
Posts: 39
Unsure. I don't have solar.
Gtx Eng is offline   Reply With Quote
Old 12-07-2020, 09:20 PM   #10
Rivet Master
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 3,083
On the Ram, the alternator regulator does not hold voltage high so once the start batteries are charged, system voltage will be around 13.2 so 12.9-13 at the trailer batteries. Without a DC to DC charger, you won't get much above 80% charge even on a long drive.
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 12-07-2020, 09:55 PM   #11
Rivet Master
 
SSquared's Avatar
 
2013 25' FB Flying Cloud
Longmont , Colorado
Join Date: Jan 2012
Posts: 839
Quote:
Originally Posted by JDG View Post
If you have a solar package installed on your coach would the batteries not charge via solar while traveling (day travel)?
Yes, rooftop solar will charge your trailer batteries while traveling. If your 7-pin charging line is connected through to your tow vehicle's electrical system, the solar may also charge your tow vehicle battery and/or provide support for the tow vehicle electrical functions.



I have 435 watts of solar on my trailer, and I normally travel with the charging line fuse removed from my tow vehicle fuse box. I don't want the charging algorithm on either end overriding what the other is doing.
SSquared 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
7 pin to 4 pin - Jeep wrangler 42570 Our Community 6 09-08-2010 10:44 PM
9 pin to 7 pin conversion ck21084 Electrical - Systems, Generators, Batteries & Solar 4 06-10-2010 03:58 PM
6-pin connector to AS 7-pin eugnicfrlie Towing, Tow Vehicles & Hitches 6 04-15-2009 11:29 PM
Adapting a 7 pin vehicle connector to a 9 pin Airstream connector PatandLane Lights - Interior & Exterior 3 03-22-2009 08:09 PM
'72 trailer 7 pin vs '99 truck 7 pin wiring? Hawkeye5 Lights - Interior & Exterior 4 08-02-2008 02:34 PM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 05:54 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.