Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
Old 06-27-2016, 12:24 PM   #1
Senior Member
 
Time-Travelers's Avatar
 
Join Date: Aug 2013
Location: Michigan
Posts: 126
Can I use shore power and umbilical cord at the same time?

Question; when hooked to shore power, is it also ok to have the truck/trailer umbilical cord connected? Last time out we tried something different when packing up. We wanted to stay connected to the shore power while raising the landing gear instead of using the battery, until it came time to do a 'pull test'. We needed to attach the umbilical cord and to check the trailer breaks, but was uncertain if we could have both powered at the same time... To avoid any damage we disconnected from shore power. Does anyone know? (Hope that made sense...) TIA!
__________________
Linda & Paul
2014 Rockwood Signature Ultralight 8292WS
2016 Ford F-150 XLT 4X4 Supercab,
3.5L V-6 Ecoboost
Time-Travelers is offline   Reply With Quote
Old 06-27-2016, 12:39 PM   #2
Senior Member
 
Join Date: Jan 2016
Location: Benbrook, Tx
Posts: 506
No idea but curious as well. It's not often I don't unhitch truck from trailer but sometimes I'm only staying overnight and leave it hooked.
__________________
Dwayne and Susan
Jiro and Phoebe-4 legged family members
Mike and Dana - Traveling buddies
2016 Ford F350 XLT 6.7 Powerstroke DRW 4X4
2016 Brookstone 395RL
dwayneb236 is offline   Reply With Quote
Old 06-28-2016, 10:03 AM   #3
Site Team
 
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 8,839
Out of an abundance of caution, I never connect the 7-way when the shore power is connected and vise-versa. I don't like the idea of two power supplies (converter & alternator) bucking each other.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
Bama Rambler is offline   Reply With Quote
Old 06-28-2016, 06:03 PM   #4
Member
 
Join Date: Jun 2016
Posts: 80
I have no idea if it is ok, but I have done it quite often.
Steve29rlx is offline   Reply With Quote
Old 06-28-2016, 06:06 PM   #5
Senior Member
 
SeaDog's Avatar
 
Join Date: Jan 2016
Location: Idaho
Posts: 8,837
I'm like BR I don't have the 7 pin connected if I'm using shore power, when I get ready to leave I hookup but leave the 7 pin for last keeping the trailer on shore power while connecting the WDH bars.
__________________
Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
SeaDog is offline   Reply With Quote
Old 06-29-2016, 12:42 AM   #6
Senior Member
 
Too Tall's Avatar
 
Join Date: Mar 2014
Posts: 862
It won't damage anything because I've forgotten to unplug a few times. I've always remembered after a while and went out and unplugged it.
__________________
Rockwood 2104S, 2014 Ram 2500 Diesel.
USMC 68 -70
Too Tall is offline   Reply With Quote
Old 06-29-2016, 01:28 AM   #7
Senior Member
 
Join Date: Jun 2016
Posts: 547
It wont damage anything, a friend of mine always leaves his truck hooked up and the shore power plugged in. However, I stopped leaving my truck connected to the camper when parked, I had an issue where my circuit breaker between the battery and the camper crapped out, It killed my truck battery, I had to get a jump start and a new battery.
wildcatter is offline   Reply With Quote
Old 06-29-2016, 10:05 AM   #8
Senior Member
 
Too Tall's Avatar
 
Join Date: Mar 2014
Posts: 862
Quote:
Originally Posted by wildcatter View Post
It wont damage anything, a friend of mine always leaves his truck hooked up and the shore power plugged in. However, I stopped leaving my truck connected to the camper when parked, I had an issue where my circuit breaker between the battery and the camper crapped out, It killed my truck battery, I had to get a jump start and a new battery.
Yes, me too. Especially If I'm over night and staying hooked up with no AC. Like a rest area etc... I'm always worried I'll wake up with a dead truck battery if I leave it connected. IMO, better be safe than sorry.
__________________
Rockwood 2104S, 2014 Ram 2500 Diesel.
USMC 68 -70
Too Tall is offline   Reply With Quote
Old 06-29-2016, 10:34 AM   #9
Senior Member
 
Join Date: Jan 2013
Location: Venice, FL Area
Posts: 328
After I'm reasonably level, I disconnect the 7 pin from the truck and plug in shore power. Now I have full power for running the jacks and slides. The last thing I do when leaving is re-connect the 7 pin to the truck. Wife will do a walk around and check for tail, brake lights and turn signals, if none then I forgot to re-connect. I also use a mini bungee cord to secure the 7 pin to the plug connection. Had it come out once, but dash indicator came on showing trailer disconnected, was able to pull over and re-connect.
__________________
18 Berkshire 34QS, 2018 Jeep Cherokee.

btritschler1437 is offline   Reply With Quote
Old 06-29-2016, 02:00 PM   #10
Senior Member
 
Join Date: Sep 2015
Location: Aurora CO
Posts: 120
I leave my 7 pin connected all the time when I am on power at home and have done so with several different TT's for years with no problems. I always have the truck plugged in when dry camping and using the jack or slides. This allows you to not burn your battery power until you need it. So far so good no issues. It is hooked up in front of my home right now with the 7 pin in and the shore power at the same time as we are leaving tomorrow for a trip. By the way, I have seen this done at our dealership as well with units that came in and needed a quick repair.
Airborne is offline   Reply With Quote
Old 06-29-2016, 02:18 PM   #11
Member
 
Join Date: Jan 2012
Posts: 55
I don't think having both sources plugged is serious, until it is. I always unhook the 7 pin because I had a problem once and the trailer killed the truck battery. So now it is a standard procedure; hook to shore power and unhook the 7 pin, always.
Larry Cole is offline   Reply With Quote
Old 06-29-2016, 02:44 PM   #12
Senior Member
 
Join Date: Apr 2012
Location: Eastern Pa
Posts: 112
My Expedition has a relay which disconnects the 12v power from the trailer whenever the ignition is turned off, so theoretically there should be no 12v connection between vehicle and trailer when the ignition is off... Don't know if others are like this, or not..

That being said, I still always unplug the vehicle cord before connecting shore power, as a precaution.
jjuscg is offline   Reply With Quote
Old 06-29-2016, 05:26 PM   #13
Newly Retired
 
Steveboe's Avatar
 
Join Date: Jan 2016
Location: North GA
Posts: 217
Two Connections

My truck lights flashed when I turn one of the outdoor spotlights on from inside the RV when I have the 7 Pin connected!
I think it's harmless but a little questionable too.
Steveboe is offline   Reply With Quote
Old 06-29-2016, 05:39 PM   #14
Senior Member
 
W5CI's Avatar
 
Join Date: Jan 2016
Location: Carlisle, Arkansas
Posts: 1,384
I dont guess it hurts anything I have been doing it for years, and as I understand the truck electrical system there is no power on plug when key is off
__________________
2005 Cedar Creek 30RLBS/TrailAir Hitch/ MORryde 7K IS/Disc Brakes/ PI PT-50 EMS/ RV Flex Armor Roof
2015 RAM 3500 DRW 6.7 Cummins 3.42/ Garmin 760RV
40 Gal TransferFlow fuel tank/ TST 507
Amateur Radio W5CI 2019 Days Camping 25
2020 Days Camping 7
W5CI is offline   Reply With Quote
Old 06-29-2016, 07:01 PM   #15
Senior Member
 
Join Date: Nov 2015
Location: Long Beach, CA
Posts: 824
Agree with almost all comments. We have been RV'ing for more than 40 years. Our experience has shown that there are usually no serious consequences of leaving the 7-pin connector between tow vehicle and RV connected while your RV is on shore power. However, we almost always disconnect the 7-pin when our trailer is on shore power, whether we are home or at a camp site. We have witnessed situations where the camp site shore power went down in the middle of the night, and those whose RV's were still connected to the tow vehicle drained their TV batteries trying to keep up with current demand. I will always prefer to have my tow vehicle battery operable.
Jakie-Boy is offline   Reply With Quote
Old 06-29-2016, 08:49 PM   #16
Senior Member
 
Join Date: Jan 2013
Location: Space Coast of Florida
Posts: 3,016
I always look for the evidence of a problem to prove it is a problem. I've been on this forum now for several years and I've yet to see the post "Well dummy me, I've drained my batterie or burned up my TV. I should have listen to all you guys about leaving my TV connected while on shore power." . That is because I don't remember seeing any posts or warning to disconnect TV, nor does my TV manual warn me.

In my TV there is a relay that disconnects the 12v from the trailer when the key is off which will keep the RV from draining or using the TV battery. When the truck is on and the converter is on the and the truck is Connected to the TV it is not a problem. The battery is a current device and will draw current from both sources much like having two 12 volt batteries wired in parallel.

If your not sure is you have a relay then disconnect when parked but if you don't the converter will keep your TV battery charged also..
__________________
2016 Siverback 33IK, Towed 40K+ miles
2018 Ford F-350 Lariat 6.7L V8 Diesel 4WD Crew Cab
Andersen Ultimate Hitch
RadMini Stepthru eBikes

"If you don't know where you are going, any road will get you there."
dalford is offline   Reply With Quote
Old 06-29-2016, 10:31 PM   #17
Senior Member
 
Too Tall's Avatar
 
Join Date: Mar 2014
Posts: 862
Quote:
Originally Posted by dalford View Post
I always look for the evidence of a problem to prove it is a problem. I've been on this forum now for several years and I've yet to see the post "Well dummy me, I've drained my batterie or burned up my TV. I should have listen to all you guys about leaving my TV connected while on shore power." . That is because I don't remember seeing any posts or warning to disconnect TV, nor does my TV manual warn me.

In my TV there is a relay that disconnects the 12v from the trailer when the key is off which will keep the RV from draining or using the TV battery. When the truck is on and the converter is on the and the truck is Connected to the TV it is not a problem. The battery is a current device and will draw current from both sources much like having two 12 volt batteries wired in parallel.

If your not sure is you have a relay then disconnect when parked but if you don't the converter will keep your TV battery charged also..
There's a couple of post in this thread from folks that had there batteries drained. I'm guessing the reason may be difference in the TV setup. The relay or whatever. One day I'll get my voltmeter out and find out how mine works while I'm in the driveway. I think most, like me, had rather err on the side of caution as being wrong could possibly leave one stranded.
__________________
Rockwood 2104S, 2014 Ram 2500 Diesel.
USMC 68 -70
Too Tall is offline   Reply With Quote
Old 06-29-2016, 10:50 PM   #18
Senior Member
 
Join Date: Jan 2013
Location: Space Coast of Florida
Posts: 3,016
Quote:
Originally Posted by Too Tall View Post
There's a couple of post in this thread from folks that had there batteries drained. I'm guessing the reason may be difference in the TV setup. The relay or whatever. One day I'll get my voltmeter out and find out how mine works while I'm in the driveway. I think most, like me, had rather err on the side of caution as being wrong could possibly leave one stranded.
I agree, better to be on safe side as far as battery drain goes, especially if your not connected to shore power.
__________________
2016 Siverback 33IK, Towed 40K+ miles
2018 Ford F-350 Lariat 6.7L V8 Diesel 4WD Crew Cab
Andersen Ultimate Hitch
RadMini Stepthru eBikes

"If you don't know where you are going, any road will get you there."
dalford is offline   Reply With Quote
Reply

Tags
power

Thread Tools
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


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 01:32 AM.