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 10-19-2015, 02:06 PM   #1
Senior Member
 
michguy's Avatar
 
National RV Owners Club
Join Date: Mar 2010
Location: Spring Lake, Michigan
Posts: 300
Correct procedure for disconnecting Batteries

I will be storing my Motorhome for a couple months outdoors in Hot Springs, Arkansas. I did this last year, hit the battery disconnect switch and left. Totally dead Chassis batteries when I got back. I just replaced the Chassis batteries a month ago, but I'm thinking I should disconnect them so that there's no draw at all on them. What is the proper procedure or disconnecting, and do I have to disconnect both the Positive and Negative terminals?

Your All Things Electric, Idiot

Michguy
__________________

__________________
Coach: '05 National TropiCal T370 Toad: '07 Saturn Aura Blog:On The Road With Dar 'n' Don
michguy 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 10-19-2015, 02:22 PM   #2
Senior Member
 
BrianGlenn's Avatar


 
Country Coach Owners Club
Join Date: Apr 2015
Location: Alberta
Posts: 907
Simply remove the negative terminal connection. I choose negative (rather than positive) because if there are any capacitance charge devices on the positive circuit there is no chance to short it out if the positive connection touches a ground plane.

PS - make sure the battery is fully charged before leaving; a partially charged/dead battery can freeze in cold weather (below freezing).
__________________

__________________
Towr: 2007 Country Coach Allure 470 - 37 Sunset Bay Cummins 400 ISL
Toad: 2016 F150 King Ranch - 3.5L EcoBoost 4x4 Supercrew (curb weight 4,775 lbs)
Toad: SOLD 2007 Jeep Grand Cherokee (yes, it has a Hemi) (curb weight 4,720 lbs)
BrianGlenn is online now   Reply With Quote
Old 10-19-2015, 02:22 PM   #3
Senior Member
 
Join Date: Jul 2015
Location: Athol, Id
Posts: 125
All you need to do is disconnect the negative terminals. This is also the correct way when removing batteries or disconnecting to do work on the DC side.
Always disconnect the negative terminals first. When reinstalling connect the negative last. In that way there is no way for a positive lead to accidentally contact a grounded surface.
__________________
2008 Dutch Star 4035
Retired IBEW Local 595
Dutchstar08 is offline   Reply With Quote
Old 10-19-2015, 02:23 PM   #4
Senior Member
 
dennis45's Avatar


 
Join Date: Jun 2012
Location: BC
Posts: 6,458
There is no reason to remove the batteries as long as they are fully charged. Purchase one of these terminal disconnect devices for each Negative (Black) terminal (One for the House batteries and one for the chassis batteries) and use that to isolate the batteries. By disconnecting the Negative cable, you have completely isolated the battery from the coach.
Now, if you plan to store the coach longer than say 2-3 months, you can simply turn the switch back on, start and run the generator for a couple hours to fully charge the batteries and then turn the switches off again to store.
This link is an example, you should be able to find these at most Auto Parts stores.
P/S. Whenever you are removing a battery, always disconnect the Negative post first to avoid a short to ground. Use the same procedure in reverse to install by installing the Positive first and then the Negative last.

http://www.amazon.com/Post-Battery-M...connect+switch
__________________
Dennis & Carol
2003, 4006, 41' DutchStar, Spartan, ISC 8.3L W/BanksPower - 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake. And the 04 Bird, Sunshine Car.
dennis45 is online now   Reply With Quote
Old 10-19-2015, 02:49 PM   #5
Registered User
 
Join Date: Sep 2014
Posts: 2,319
Just pull Negative lead.




That way if you fumble the lead like say the U of M punter .......
__________________
okcnewbie is offline   Reply With Quote
Old 10-19-2015, 02:53 PM   #6
Senior Member
 
Monaco Owners Club
Holiday Rambler Owners Club
Join Date: Jan 2013
Location: michigan-tip of the mitt
Posts: 1,382
Well Michguy maybe a SPARTAN can give you an answer. If you only have one battery disconnect switch that is for the house only. The chassis batteries are still connected and a draw-down is possible. Soooo add another disconnect switch. Or disconnect battery. Positive cable first (red 1 )then the ground (black 1 ). When reconnecting, red first then black.
__________________
HR 29 fks TT, 1 slide, Chevy Silverado
Next stop?
t55watson is offline   Reply With Quote
Old 10-19-2015, 02:58 PM   #7
Senior Member
 
Tony Lee's Avatar
 
Join Date: Sep 2012
Location: Peru heading for Brasilia, Brazil
Posts: 2,117
NO!!!

Negative cable FIRST, then positive. Reason is the most likely path for shorting out with a spanner is to grounded metal around the battery. No spark if you are disconnecting the negative. Once negative is disconnected then a short from positive to grounded metal doesn't matter.

ALWAYS possibility of very dangerous short from positive terminal to negative terminal via a spanner so care needed - of use wrench with insulated handle. Safety glasses recommended.

To replace, Positive cable first, negative LAST

Also smart to take a photo before you touch anything. Use black and red tape to clearly identify cables going to negative and positive terminals.

If you have two 12V batteries in parallel, then just disconnect BOTH negative leads.
__________________
Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
Tony Lee is offline   Reply With Quote
Old 10-19-2015, 03:02 PM   #8
Senior Member
 
Monaco Owners Club
Holiday Rambler Owners Club
Join Date: Jan 2013
Location: michigan-tip of the mitt
Posts: 1,382
Quote:
Originally Posted by Tony Lee View Post
NO!!!

Negative cable FIRST, then positive.

To replace, Positive cable first, negative LAST

Also smart to take a photo before you touch anything.

If you have two 12V batteries in parallel, then just disconnect BOTH negative leads.
If you touch the red cable to the positive post when the black cable is connected you will get a spark. Sometimes a BIG spark. This introduces the possibility of big BANG from the gasses that are given off of a battery.
__________________
HR 29 fks TT, 1 slide, Chevy Silverado
Next stop?
t55watson is offline   Reply With Quote
Old 10-19-2015, 03:04 PM   #9
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 16,239
I think realistically just disconnecting the ground cable while the RV sits in storage is plenty.

Your present disconnect switch is an electrically operated solenoid, correct? If you added another one of those on the other set of batteries, where would the power come from to trigger the solenoid for reconnect???

If you do plan to remove all the cables from the batteries, not only take a photo but label them to make it clear where they go 4-6 months from now. If you just disconnect the ground cables, perhaps not needed. If the batteries are fully charged when you store the RV, they will be very close to full when you reconnect in the Spring, charged batteries will not freeze, so you should be good to go.
__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is online now   Reply With Quote
Old 10-19-2015, 03:22 PM   #10
Senior Member
 
Tony Lee's Avatar
 
Join Date: Sep 2012
Location: Peru heading for Brasilia, Brazil
Posts: 2,117
If other motorhomes are like mine there will be two batteries in parallel for the engine battery and several cables, large and small, on each terminal. In that case, deciding how many disconnects and where to put them is not so clear cut.

Same problem with the house batteries. Bad design of course but some systems grow like Topsy and stuff that is added later is just connected to whatever terminal has a bit of space.
__________________
Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
Tony Lee is offline   Reply With Quote
Old 10-19-2015, 03:30 PM   #11
Senior Member
 
Join Date: Jul 2014
Posts: 9,880
Quote:
Originally Posted by t55watson View Post
If you touch the red cable to the positive post when the black cable is connected you will get a spark. Sometimes a BIG spark. This introduces the possibility of big BANG from the gasses that are given off of a battery.
If the cable is going to spark, it will spark from the negative or positive cable connection.
You need 2 connections to complete a circuit.

Do not connect the cables while, or having recently, charged the battery. That is when it will be giving off the explosive gases.

A good, resting battery will not be gassing, otherwise they would be exploding all over the place.

Standard practice is to remove or connect the negative first for the reasons mentioned.
__________________
twinboat is online now   Reply With Quote
Old 10-19-2015, 03:44 PM   #12
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 16,239
twinboat, there you go introducing logic and fact into a discussion about electricity. Many folks still believe in magic smoke that can be released if the gods don't like you.
__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is online now   Reply With Quote
Old 10-19-2015, 04:04 PM   #13
Senior Member
 
Join Date: Jan 2008
Location: Big Bear Lake, Ca
Posts: 886
I added a manual marine style disconnect.
__________________
2004 CRV TOAD/1990 WRANGLER TOAD ROCK BUILT
Forest Grump is offline   Reply With Quote
Old 10-19-2015, 04:05 PM   #14
Member
 
Join Date: May 2013
Location: Tucson, AZ
Posts: 50
Since batteries are so expensive and getting more so, I always take my batteries out and store them in the garage with a smart charger on them such as Battery Tender. I have 12v batteries. If you have two batteries, I do, I use the cable from the coach to hook positive of one battery to the positive of the other battery as well as the negative to the negative (12v batteries are hooked up in parallel). The Battery Tender is then hooked the positive of battery one and the negative of battery two. It produces enough amps to keep both batteries charged.
__________________

__________________
tgdameron is offline   Reply With Quote
Reply

Tags
batteries



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
1997 Monaco House Batteries pablosanchez Monaco Owner's Forum 9 10-31-2015 07:28 PM
Damon Challenger 372W House Batteries Don't Charge WiSchmidtFam Class A Motorhome Discussions 9 07-09-2015 09:14 AM
Need your advice. House batteries not charging on shore power or generator UtahRv Class C Motorhome Discussions 11 06-14-2015 11:39 PM
House Batteries cooked on us! RV1597 RV Systems & Appliances 13 07-05-2014 02:26 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:24 AM.


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