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

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 10-29-2020, 08:31 PM   #1
Junior Member
 
Join Date: Oct 2020
Posts: 9
Power issue when use shore power

So when I use generator power is fine but when I plug in shore power i get 240 at breaker panel but when I turn on any breakers power goes freaky put meter on it and one leg drops to 70 volt other goes to 245 but shut off breaker and goes back to normal 120 on both legs don't get it please help
Oilman04957 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 10-29-2020, 08:57 PM   #2
Senior Member
 
wingnut60's Avatar
 
Join Date: Aug 2004
Location: Wherever we are
Posts: 4,029
Probably need more info on what unit you have--make/model/year?

Based on your username--how's the oilfield doing?
__________________
'16 40QBH Phaeton
'15 38RSSA Mobile Suites--traded
'05 36TK3 Mobile Suites--retired but not forgotten
wingnut60 is offline   Reply With Quote
Old 10-29-2020, 08:59 PM   #3
Senior Member
 
Join Date: Jul 2014
Posts: 24,745
Bad neutral ( white ) wire connection somewhere.

Its what keeps the voltage in balance.

Check the outlet, plug, auto transfer switch, cord real, and white wire in breaker panel.

Carefully with your problem, you can burn things up.
twinboat is online now   Reply With Quote
Old 10-29-2020, 09:42 PM   #4
Senior Member
 
Rkesselus's Avatar
 
Tiffin Owners Club
Join Date: Aug 2016
Location: Bastrop Texas
Posts: 1,279
If you are reading from each of the positive poles you should get 240. I assume you have a 50 amp RV plug. Read from one positive to the common and you should get 120 Read from the other positive to the common you should get 120. the ground position is the round prong the two vertical prongs opposite each other are the two positives the other prong opposite the round prong is the ground. I would start at the source of the shore power pedestal or just outlet and make sure the voltage is correct there. If it is check where the power cord connects to the transfer switch. The positive wires should be red and black the common would be white and the ground green or a bare copper wire. Check the voltage where the power cord connects to the transfer switch. It should read the same as mentioned above. It would help if you tell us what lines are giving you those strange reading. The fact that the generator is providing correct power would indicate that the transfer switch is working correctly when disconnected from shore power. I can not imagine how you could get the readings past the transfer switch.
__________________
2000 Allegro Bus 35R 3126 Cat 300 Allison 3060MD 6 speed
Rkesselus is offline   Reply With Quote
Old 10-29-2020, 09:55 PM   #5
Senior Member
 
Join Date: Nov 2015
Posts: 13,937
Quote:
Originally Posted by twinboat View Post
Bad neutral ( white ) wire connection somewhere.

Its what keeps the voltage in balance.

Check the outlet, plug, auto transfer switch, cord real, and white wire in breaker panel.

Carefully with your problem, you can burn things up.
YEP^^^^^
__________________
Is it time for YOUR Medication or Mine?
Dodge 3500 w/Tractor Motor & NUWA 5vr
US NAVY---USS Decatur DDG-31
Old-Biscuit is online now   Reply With Quote
Old 10-29-2020, 10:00 PM   #6
Senior Member
 
Join Date: Sep 2009
Location: Central Indiana
Posts: 844
Power issue when use shore power

The condition is called a floating neutral which can cause either leg to be 0-240volts. Carefully fix before you destroy whatever may be in the greatest leg. If the voltage is correct between neutral and each leg inside the transfer switch the the problem is between it and the main panel. With all power sources disconnected look for loose connections. Tighten all to be sure
mrboyer is offline   Reply With Quote
Old 10-29-2020, 10:06 PM   #7
Senior Member
 
Join Date: Jul 2014
Posts: 24,745
You won't be able to check with a volt meter.

Without any load, the voltage will be even, 120 on each leg. It only goes out of balance, one high and the other low, when one leg has a load on it. That's already been determined.

You need to find a bad connection ( resistance ) in the white ( neutral ) wire.

There is no positive or negetive in AC current.
twinboat is online now   Reply With Quote
Old 10-30-2020, 01:49 AM   #8
Senior Member
 
mdpuff's Avatar
 
Monaco Owners Club
Join Date: Nov 2013
Location: Alberta
Posts: 218
This might be a long shot but last winter we were in a park in Arizona plugged into 50 amp service and my wife overloaded a circuit (happened a few times) running electric heater and the microwave and it generally popped a breaker.
This one time however this happened again, no problem, reset the breaker, nope, not it, searched all over testing with my volt meter and got all sorts of strange readings then traced it down to my inverter. Pulled the little panel off the end on the bottom of the inverter and wiggled the wires and got some sparks!! HOLY CRAP!! Unplugged the power and pulled out the wires and this is what I found, solid core wire spliced to stranded wire with wire nuts. They don't work so good for this so I used some really good heat shrink butt connectors to fix it and everything was good. Glad the RV didn't burn down!!
Attached Thumbnails
Click image for larger version

Name:	SAM_4072.jpg
Views:	5
Size:	179.7 KB
ID:	306436  
__________________
2009 Monaco Camelot 425 Hp 42DSQ
mdpuff is offline   Reply With Quote
Old 10-30-2020, 01:50 AM   #9
Senior Member
 
mdpuff's Avatar
 
Monaco Owners Club
Join Date: Nov 2013
Location: Alberta
Posts: 218
Oh by the way, this was on our old coach, not the Monaco we just bought.
__________________
2009 Monaco Camelot 425 Hp 42DSQ
mdpuff is offline   Reply With Quote
Old 10-30-2020, 02:05 AM   #10
Senior Member
 
Country Coach Owners Club
Join Date: Oct 2016
Location: Branson, MO
Posts: 285
Quote:
Originally Posted by Oilman04957 View Post
So when I use generator power is fine but when I plug in shore power i get 240 at breaker panel but when I turn on any breakers power goes freaky put meter on it and one leg drops to 70 volt other goes to 245 but shut off breaker and goes back to normal 120 on both legs don't get it please help
I would start with the shore power source. Try a different source.
Kodiakan is offline   Reply With Quote
Old 10-30-2020, 06:01 AM   #11
Junior Member
 
Join Date: Oct 2020
Posts: 9
Think I going to run new wire from panel to shore pole plug i thought it was just my transfer switch so I replaced it but have not plugged shore power back in don't want to burn it up if I got bad power going to it oh by the way this is at my home not camping ty for all help
Oilman04957 is offline   Reply With Quote
Old 10-30-2020, 06:04 AM   #12
Junior Member
 
Join Date: Oct 2020
Posts: 9
Quote:
Originally Posted by twinboat View Post
Bad neutral ( white ) wire connection somewhere.

Its what keeps the voltage in balance.

Check the outlet, plug, auto transfer switch, cord real, and white wire in breaker panel.

Carefully with your problem, you can burn things up.
How do you check for floating neutral i have un plugged shore line and did continuity and seemed fine
Oilman04957 is offline   Reply With Quote
Old 10-30-2020, 06:10 AM   #13
Junior Member
 
Join Date: Oct 2020
Posts: 9
Quote:
Originally Posted by wingnut60 View Post
Probably need more info on what unit you have--make/model/year?

Based on your username--how's the oilfield doing?
Have a Harney coach 1999 37 ft renegade casagrande
Oilman04957 is offline   Reply With Quote
Old 10-30-2020, 06:13 AM   #14
Junior Member
 
Join Date: Oct 2020
Posts: 9
Quote:
Originally Posted by Rkesselus View Post
If you are reading from each of the positive poles you should get 240. I assume you have a 50 amp RV plug. Read from one positive to the common and you should get 120 Read from the other positive to the common you should get 120. the ground position is the round prong the two vertical prongs opposite each other are the two positives the other prong opposite the round prong is the ground. I would start at the source of the shore power pedestal or just outlet and make sure the voltage is correct there. If it is check where the power cord connects to the transfer switch. The positive wires should be red and black the common would be white and the ground green or a bare copper wire. Check the voltage where the power cord connects to the transfer switch. It should read the same as mentioned above. It would help if you tell us what lines are giving you those strange reading. The fact that the generator is providing correct power would indicate that the transfer switch is working correctly when disconnected from shore power. I can not imagine how you could get the readings past the transfer switch.
Getting these readings in circuit breaker box in rv
Oilman04957 is offline   Reply With Quote
Reply

Tags
power, shore power



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
Plugging into shore power trips shore power breaker BFF Travel Supreme Owner's Forum 8 07-28-2017 11:53 PM
Cost to use inverter on shore Power? Sky_Boss RV Systems & Appliances 26 01-04-2014 09:18 AM
Radio use/shore power JST WVR Class C Motorhome Discussions 8 03-15-2013 10:04 AM
Shore power charging battery in "use/"store" position 00DAME Class A Motorhome Discussions 3 02-04-2013 11:49 AM
Shore power and generator power issue BracketRacer iRV2.com General Discussion 2 09-03-2012 02:19 PM


All times are GMT -6. The time now is 09:50 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.