Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
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 03-19-2023, 11:53 AM   #1
Junior Member
 
Monaco Owners Club
Holiday Rambler Owners Club
Join Date: Oct 2009
Posts: 11
Ground issue

Greetings from southern Oregon,
I am having issues with the primary ground after replacing all four 6V house batteries. I have checked and have had others check my connections to make certain that all is as I took it apart. I took pictures as well to make certain that all cables were properly connected. Issue is, the primary negative cable arcs when touched to the negative battery post. I'm curious to know if anyone knows what the primary negative cable is attached to on the other end (battery isolator or?) or what the possible problem is.



My coach is a 2009 Holiday Rambler Scepter 42PDQ. My thanks in advance.


Jim


Sherman 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 03-19-2023, 12:45 PM   #2
Senior Member
 
Join Date: Jul 2014
Posts: 33,284
It's attached to the inverter/charger. Anytime you connect one, it will spark as it's energizing.
twinboat is online now   Reply With Quote
Old 03-19-2023, 01:07 PM   #3
Senior Member
 
Join Date: Nov 2018
Location: Beaver Dam, Wisconsin
Posts: 4,247
Basically Twinboat is correct.

The negative cable on the battery completes the circuit for all 12 volt devices. A charger provides power that can easily cause a spark. Inverters draw power that can cause a spark.

Many inverter/charger designs have a large capacitor on the 12 volt input/output. Charging the capacitor every time it is connected can easily cause a significant spark. There are lots of other possibilities.

It is best to turn all 12 volt devices "off" before disconnecting or connecting the batteries. Many owners install a capacitor charging circuit if they have an inverter/charger with a big capacitor.

Bag or tape all loose ends as soon as disconnected. Loose wires can cause significant electrical damage accidentally.
__________________
Paul Bristol
Kodiak Cub 176RD
Nissan Pathfinder 2015
Persistent is offline   Reply With Quote
Old 03-19-2023, 02:04 PM   #4
"Formerly Diplomat Don"
 
Dutch Star Don's Avatar
 
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 22,395
Monaco used Magnum Inverters in most models during the era of your coach. Magnum recommends disconnecting the positive cable first and reconnecting the positive cable last when disconnecting batteries.
__________________
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
Dutch Star Don is offline   Reply With Quote
Old 03-19-2023, 07:36 PM   #5
Senior Member
 
153stars's Avatar
 
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 7,548
Good point brought up by Don....The reason is internally the Magnum can seek a ground in smaller circuitry and hurt electronics. The spark would likely be the same ,charging up inverter with pos. last as well though.
I follow Will Prowse for battery and solar info he has procedure he follows to charge hook up inverters every time. It's probably more to protect the BMS in Lifepo batts from surge.
Quote:
Originally Posted by Dutch Star Don View Post
Monaco used Magnum Inverters in most models during the era of your coach. Magnum recommends disconnecting the positive cable first and reconnecting the positive cable last when disconnecting batteries.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
153stars is offline   Reply With Quote
Old 03-20-2023, 07:26 AM   #6
Senior Member
 
Join Date: Feb 2022
Posts: 251
my connection will spark when I complete the circuit. It doesn't take much current to produce a spark.
You can find out for sure if you have a problem by measuring the current that flows from the neg terminal to ground. You can do this with most volt meters. But be cautioned that setting up a meter to measure current can lead to destruction of the meter if its not done properly. Caution is merited.
I have ruined a few hand held meters in my day by just not paying attention to what I was doing.

Feel free to PM me if you want to do this yourself. If not any shop should be able to measure the current. Many things in a RV will draw some current when everything is off ( example, Propane alarm ) so some current is expected. But if everything is off, there should be less than 0.5 amp flowing out of the batteries when everything is off. This is often referred to as " parasitic " draw.
kwftlaud is offline   Reply With Quote
Old 03-20-2023, 10:21 AM   #7
Senior Member
 
153stars's Avatar
 
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 7,548
If your real worried to see amps AC/DC meter with max amp inrush function. I skipped it ,one I picked because I liked the white lighted screen on lesser model.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
153stars is offline   Reply With Quote
Old 03-20-2023, 08:35 PM   #8
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 28,561
The house battery bank should have 2 negative and 2 positive main cables. One of each goes to the inverter. the other neg. cable goes to the chassis frame and the other pos. cable goes to the main 12V distribution panel for the house part; otherwise you could not run 12V appliances without the inverter switch on.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 03-20-2023, 08:47 PM   #9
Senior Member
 
Join Date: Apr 2018
Posts: 3,340
It sparks mostly because the electrons flow from the negative to the positive. The positive is short on electrons, the negative has an excess. They just got to get home.
__________________
2004 Dynasty 4
shootist is online now   Reply With Quote
Old 03-21-2023, 04:53 PM   #10
Senior Member
 
Tha_Rooster's Avatar
 
Join Date: Aug 2008
Location: Georgia
Posts: 8,353
Quote:
Originally Posted by Sherman View Post
Greetings from southern Oregon,
I am having issues with the primary ground after replacing all four 6V house batteries. I have checked and have had others check my connections to make certain that all is as I took it apart. I took pictures as well to make certain that all cables were properly connected. Issue is, the primary negative cable arcs when touched to the negative battery post. I'm curious to know if anyone knows what the primary negative cable is attached to on the other end (battery isolator or?) or what the possible problem is.



My coach is a 2009 Holiday Rambler Scepter 42PDQ. My thanks in advance.


Jim




I believe isolator is on the positive side. Triple check wiring could be something as simple like one battery turned around and hooked up wrong. 99% of the time when someone has battery problems after changing itís they left off a wire or hooked up wrong.
__________________
2007 Fleetwood Revolution LE 40V
Tha_Rooster is offline   Reply With Quote
Old 03-22-2023, 08:26 AM   #11
Senior Member


 
Join Date: Jan 2009
Posts: 4,564
Quote:
Originally Posted by Sherman View Post
Greetings from southern Oregon,
I am having issues with the primary ground after replacing all four 6V house batteries. I have checked and have had others check my connections to make certain that all is as I took it apart. I took pictures as well to make certain that all cables were properly connected. Issue is, the primary negative cable arcs when touched to the negative battery post. I'm curious to know if anyone knows what the primary negative cable is attached to on the other end (battery isolator or?) or what the possible problem is.



My coach is a 2009 Holiday Rambler Scepter 42PDQ. My thanks in advance.


Jim


Hopefully remedied by now but didn't see this asked. How big an arc was it? As said, it's normal to have a little spark. And that spark would probably be even smaller if immediately disconnected then reconnected.

You can hook the cable to the battery, if the spark isn't too obnoxious, then use a clamp on DC amp meter to see the draw.
__________________
03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
Mudfrog is offline   Reply With Quote
Old 03-22-2023, 08:57 AM   #12
Senior Member
 
Join Date: Apr 2018
Posts: 3,340
Quote:
Originally Posted by Mudfrog View Post
Hopefully remedied by now but didn't see this asked. How big an arc was it? As said, it's normal to have a little spark. And that spark would probably be even smaller if immediately disconnected then reconnected.

You can hook the cable to the battery, if the spark isn't too obnoxious, then use a clamp on DC amp meter to see the draw.
There is no draw as such, there is a difference in potential, once it equalizes there should be only a small draw by the various always on electronics. Capacitors are the biggest momentary draw.
__________________
2004 Dynasty 4
shootist is online now   Reply With Quote
Old 03-23-2023, 08:36 PM   #13
Senior Member
 
Forza Bill's Avatar
 
Join Date: Jan 2023
Posts: 123
You want to see sparks? I worked on my 48V golf cart recently. That will get your attention!
__________________
2015 Winnebago Forza 34T
Cummins 340 HP
Fiat 500 Toad
Forza Bill is offline   Reply With Quote
Old 03-23-2023, 09:17 PM   #14
Senior Member
 
Join Date: Apr 2018
Posts: 3,340
Quote:
Originally Posted by Forza Bill View Post
You want to see sparks? I worked on my 48V golf cart recently. That will get your attention!
As in 4th of July🤣
__________________
2004 Dynasty 4
shootist is online now   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
Ground 12v wire to 120v ground wire jespo27 RV Systems & Appliances 9 07-03-2022 08:49 AM
Onboard ground fault conflicts with campground ground fault skatebus80 Country Coach Owners Forum 3 07-15-2017 12:42 PM
Ground clearance with jacks up down to the ground Rvlegaleagle Class C Motorhome Discussions 8 09-01-2016 06:54 AM
Positive ground or negative ground? 1010 iRV2.com General Discussion 43 07-14-2015 11:29 AM
no ground ok-ground trips gfi FLYING BUTCH iRV2.com General Discussion 14 06-01-2011 06:52 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 10:07 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.