7 pin power question - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-02-2013, 09:39 AM   #1
Member
 
Name: geoff
Trailer: bigfoot
Saskatchewan
Posts: 38
7 pin power question

I am new to towing, and I have a question about the power running to the 7 pin connector. It seems that the power is live to the battery and not the ignition, so if (assuming I turn off every light, etc. in the camper) I leave it plugged in will it drain the tow vehicle battery? What if the camper battery is fully charged, will it still take power from the tow vehicle battery?

Thanks!
__________________

__________________
spartacus is offline   Reply With Quote
Old 06-02-2013, 09:57 AM   #2
Senior Member
 
Thomas G.'s Avatar
 
Name: Kinga DeRode
Trailer: For Sale Or Rent
Rooms to Let 50 Cents
Posts: 5,103
The trailer will drain the tow vehicle battery if not disconnected. The usual solution is to install a relay wired to the ignition so it disconnects automatically. You can also install an isolating diode, but be sure to get one with a low voltage drop or it will hamper your trailer battery charging.
__________________

__________________
UHaul and Burro owners, join the UHaul Campers on Facebook. https://www.facebook.com/groups/529276933859491/
Thomas G. is offline   Reply With Quote
Old 06-02-2013, 10:08 AM   #3
Senior Member
 
floyd's Avatar
 
Name: Floyd
Trailer: 2004 13 ft Scamp Custom Deluxe
IllAnnoy
Posts: 6,043
Registry
Quote:
Originally Posted by spartacus View Post
I am new to towing, and I have a question about the power running to the 7 pin connector. It seems that the power is live to the battery and not the ignition, so if (assuming I turn off every light, etc. in the camper) I leave it plugged in will it drain the tow vehicle battery? What if the camper battery is fully charged, will it still take power from the tow vehicle battery?

Thanks!
If what you say is correct, then a draw from the trailer will drain the TV battery.
Many systems use a battery isolator which will prevent this when the key is off.
I use an inline breaker and a manual 30A switch with an LED indicator light.
As you say, if the battery on the trailer is fully charged and has no load applied then it will not drain itself or the TV battery.
__________________
floyd is online now   Reply With Quote
Old 06-02-2013, 10:19 AM   #4
Senior Member
 
Byron Kinnaman's Avatar
 
Name: Byron
Trailer: 2006 Scamp 13' towed with a 2005 Dodge Dakota 4.7l Magnum W/full tow package (over kill)
Oregon
Posts: 6,306
Registry
Quote:
Originally Posted by spartacus View Post
I am new to towing, and I have a question about the power running to the 7 pin connector. It seems that the power is live to the battery and not the ignition, so if (assuming I turn off every light, etc. in the camper) I leave it plugged in will it drain the tow vehicle battery? What if the camper battery is fully charged, will it still take power from the tow vehicle battery?

Thanks!
There's not a yes or no answer, it all depends.
When connected in the manner you describe any power consumption devices in the trailer will draw from both batteries, any devices in the tow will draw from both batteries. With nothing on in the trailer except the propane detector it will take several days to run both batteries down. A stop for lunch or even over night is NOT going to have much effect.
FYI, my factory tow package connects the battery in the tow directly to the battery in the trailer when the trailer is plugged into the tow. My standard procedure is to disconnect the trailer when camping, or a quick overnight sleep. I leave it connected for all rest stops including meal brakes.

Hope this helps a bit.
__________________
Byron & Anne enjoying the everyday Saturday thing.
Byron Kinnaman is offline   Reply With Quote
Old 06-02-2013, 11:03 AM   #5
Senior Member
 
Bob Miller's Avatar
 
Name: Bob
Trailer: 1973 Hunter Compact II
California
Posts: 7,912
A solenoid type battery isolator is readily available at most RV stores, as well as on line, for less than $20 and is easy to install. It assures that the trailer is disconnected from the TV battery unless the ignition switch is turned on

These are pretty much standard equipment on motorhomes to protect the engine battery from being run down by the coach when parked.
__________________
Bob Miller is offline   Reply With Quote
Old 06-02-2013, 11:07 AM   #6
Senior Member
 
Jon Vermilye's Avatar
 
Name: Jon
Trailer: 2017 Escape 21
Oswego, NY
Posts: 1,405
Registry
I added an isolation relay when I wired the RAV4 charge line. Luckily, there was a 12V receptacle in the rear side panel of the RAV4 that I used to feed the sense coil of the relay.

If you have a 12V heater in your refrigerator & use it while driving, the relay is important - if you forget to unplug the trailer during a long lunch you may find everything dead...
__________________

Jon Vermilye 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
A Question About Shore Power Red-Dwarf Problem Solving | Owners Helping Owners 10 03-21-2012 05:20 PM
Changing from 6 pin to 7 pin on truck - how?? Shelley Towing, Hitching, Axles and Running Gear 4 07-28-2009 11:45 PM
7-pin wiring question Bonnie Problem Solving | Owners Helping Owners 3 07-28-2007 12:51 PM
Battery power question Sharon Herman Care and Feeding of Molded Fiberglass Trailers 31 03-30-2006 10:39 PM
Flat Pin vs Round Pin Connectors Legacy Posts Problem Solving | Owners Helping Owners 7 04-07-2003 12:34 PM

» Upcoming Events
No events scheduled in
the next 465 days.
» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:49 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.