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 05-17-2011, 08:47 PM   #1
Junior Member
 
lezmark's Avatar
 
Join Date: May 2011
Location: Rancho Cucamonga
Posts: 13
Coach battery is powering house - how to fix?

I have confirmed with a voltage meter that the coach battery is helping the house batteries power the interior. I know that should not happen and there must be a broken switch or solenoid. Can someone please help me with where to find this "switch" and the best way (economical) to repair. I am a pretty good do it myselfer. Thanks
__________________

__________________
2006 Newmar Scottsdale
Grand Cherokee GRT8TOAD !
lezmark 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 05-17-2011, 09:02 PM   #2
Senior Member
 
RJay's Avatar
 
Newmar Owners Club
Join Date: Jan 2010
Posts: 4,589
My guess is it could either be the BIRD failure that controls the solenoids that connect the coach and chassis batteries, or a solenoid failed closed. One way to test is to close the emergency start switch and see if you can hear the solenoid close. If it's failed closed you won't hear anything.
__________________

__________________
2007 Newmar DSDP 4023
Discovery is seeing what everyone else has seen and thinking what no one else has thought.
If you want to see what man made go East; if you want to see what God made go West.
RJay is offline   Reply With Quote
Old 05-17-2011, 09:15 PM   #3
Senior Member
 
Country Coach Owners Club
Vintage RV Owners Club
Florida Cooters Club
Join Date: Aug 2010
Location: Central Florida
Posts: 337
lezmark,
A little history would help us sleuth the problem:
1. When did this begin? ...Have you had any work done on the coach (even if unrelated to the batteries) since things were "normal"?
2. Have you had any electrical gremlins or glitches... a nearby lightning strike or spike in your pedestal or any abnormal generator/transfer switch issues?
3. Can you confirm the proper functioning of your battery isolator if equipped?
My initial thought is a "clampped on" booster switch caused by a faulty solenoid. Try to determine if the booster circuit is functioning properly.
Meanwhile, when parked you can probably use the chassis (starting) battery cut-off switch to keep it from being siphoned off by the house batteries.
Happy hunting and keep us posted...
Jim
__________________
Jim and Fran in Central Florida
1989 Country Coach Sedona Mark V
Turbocharged Detroit Diesel 8.2L "Fuel Pincher"
Good man is offline   Reply With Quote
Old 05-17-2011, 09:16 PM   #4
Junior Member
 
lezmark's Avatar
 
Join Date: May 2011
Location: Rancho Cucamonga
Posts: 13
Quote:
Originally Posted by RJay View Post
My guess is it could either be the BIRD failure that controls the solenoids that connect the coach and chassis batteries, or a solenoid failed closed. One way to test is to close the emergency start switch and see if you can hear the solenoid close. If it's failed closed you won't hear anything.
If that is the battery boost panel button, I tried that and all was quiet...
__________________
2006 Newmar Scottsdale
Grand Cherokee GRT8TOAD !
lezmark is offline   Reply With Quote
Old 05-17-2011, 09:26 PM   #5
Senior Member
 
Country Coach Owners Club
Vintage RV Owners Club
Florida Cooters Club
Join Date: Aug 2010
Location: Central Florida
Posts: 337
I think you have found the source of the problem as RJay and I both suspected. That Boost solenoid is typically located in the house battery bay and will tie the house batteries over to the starting battery when the momentary contact dash switch is activated.
You can easily confirm if it is clamped on by testing. If you disconnect it, be sure to protect the energized lead cables from shorting against the frame.
__________________
Jim and Fran in Central Florida
1989 Country Coach Sedona Mark V
Turbocharged Detroit Diesel 8.2L "Fuel Pincher"
Good man is offline   Reply With Quote
Old 05-17-2011, 09:27 PM   #6
Junior Member
 
lezmark's Avatar
 
Join Date: May 2011
Location: Rancho Cucamonga
Posts: 13
Quote:
Originally Posted by Good man View Post
lezmark,
A little history would help us sleuth the problem:
1. When did this begin? ...Have you had any work done on the coach (even if unrelated to the batteries) since things were "normal"? NO
2. Have you had any electrical gremlins or glitches... a nearby lightning strike or spike in your pedestal or any abnormal generator/transfer switch issues? NO
3. Can you confirm the proper functioning of your battery isolator if equipped? I dont know what that is. I discovered this by accident. I have been keeping my batteries charged while in storage by disconnecting the grounds to the house batteries. I was putting in a disconnect switch and when I still had power is how I discovered this. It could have been happening quite a while.
My initial thought is a "clampped on" booster switch caused by a faulty solenoid. Try to determine if the booster circuit is functioning properly.
Meanwhile, when parked you can probably use the chassis (starting) battery cut-off switch to keep it from being siphoned off by the house batteries. I dont think I have a cut off switch - I do have the use and store switch on my control panel. The only other battery related switch is on the dash - the boost... thanks for the help!
Happy hunting and keep us posted...
Jim

Thanks
__________________
2006 Newmar Scottsdale
Grand Cherokee GRT8TOAD !
lezmark is offline   Reply With Quote
Old 05-17-2011, 09:36 PM   #7
Senior Member
 
Country Coach Owners Club
Vintage RV Owners Club
Florida Cooters Club
Join Date: Aug 2010
Location: Central Florida
Posts: 337
lezmark,
We're getting our posts out of sequence here due to the response lag, but...
To answer your question;
A battery isolator is used in dual battery vehicles to ensure that each battery (or bank of batteries) gets a proper charge. The islolator senses battery status and switches between batteries so that when one battery is charged it does not allow the alternator to think it's work is all done.
Meanwhile, having determined that you are not hearing a click when the dashboard Boost switch is activated, I think you have found the problem.
If not, come back and we'll keep digging.
Jim
__________________
Jim and Fran in Central Florida
1989 Country Coach Sedona Mark V
Turbocharged Detroit Diesel 8.2L "Fuel Pincher"
Good man is offline   Reply With Quote
Old 05-17-2011, 09:42 PM   #8
Junior Member
 
lezmark's Avatar
 
Join Date: May 2011
Location: Rancho Cucamonga
Posts: 13
Quote:
Originally Posted by Good man View Post
lezmark,
We're getting our posts out of sequence here due to the response lag, but...
To answer your question;
A battery isolator is used in dual battery vehicles to ensure that each battery (or bank of batteries) gets a proper charge. The islolator senses battery status and switches between batteries so that when one battery is charged it does not allow the alternator to think it's work is all done.
Meanwhile, having determined that you are not hearing a click when the dashboard Boost switch is activated, I think you have found the problem.
If not, come back and we'll keep digging.
Jim
I REALLY appreciate all the help. Can you tell me how to find/identify this isolator? I just looked around the battery and am not sure what I am looking for. There is one little box with a connection each side and I think it might be a fuse since I think I saw BUSS...
__________________
2006 Newmar Scottsdale
Grand Cherokee GRT8TOAD !
lezmark is offline   Reply With Quote
Old 05-17-2011, 09:51 PM   #9
Senior Member
 
RJay's Avatar
 
Newmar Owners Club
Join Date: Jan 2010
Posts: 4,589
The isolator is usually in the power bay where your power cord is located. It's usually behind a piece of vinyl sheet on the back wall of the compartment but it could be somewhere else on your model.
__________________
2007 Newmar DSDP 4023
Discovery is seeing what everyone else has seen and thinking what no one else has thought.
If you want to see what man made go East; if you want to see what God made go West.
RJay is offline   Reply With Quote
Old 05-17-2011, 09:59 PM   #10
Senior Member
 
Country Coach Owners Club
Vintage RV Owners Club
Florida Cooters Club
Join Date: Aug 2010
Location: Central Florida
Posts: 337
lezmark,
I will be glad to help you with the isolator question, but may I suggest that you rule out the Boost solenoid before you go any further? All your symptoms seem to point at that little sucker as the culprit. Not good to go in two directions at one time when trying to ferret out a glitch like this.
You can Google "battery isolator" and any number of sites will pop up with pictures of the isolator and descriptions. Typically, it is located in the engine bay and is wired to the alternator... has big cooling fins on it.
I am not sure what the little box in your battery bay is, but it sounds like a fusible link... essentially a one-time circuit breaker... but it could also be a component of your "use/store" circuitry.
Keep working on locating that Boost solenoid... you won't be sure till you can get a distinctive click of a solenoid when you activate the dash switch... methinks it is the culprit.
Jim
__________________
Jim and Fran in Central Florida
1989 Country Coach Sedona Mark V
Turbocharged Detroit Diesel 8.2L "Fuel Pincher"
Good man is offline   Reply With Quote
Old 05-17-2011, 10:16 PM   #11
Senior Member
 
RJay's Avatar
 
Newmar Owners Club
Join Date: Jan 2010
Posts: 4,589
Here is some information about RV battery isolation relays.
__________________
2007 Newmar DSDP 4023
Discovery is seeing what everyone else has seen and thinking what no one else has thought.
If you want to see what man made go East; if you want to see what God made go West.
RJay is offline   Reply With Quote
Old 05-17-2011, 11:05 PM   #12
Senior Member
 
Luv2go's Avatar
 
Newmar Owners Club
Nor'easters Club
Appalachian Campers
Ford Super Duty Owner
Coastal Campers
Join Date: Dec 2007
Posts: 1,889
lezmark:

Your battery isolation relay should be located in a clear box on the firewall above your radiator. Along with the relay is a BIRD, which will connect the two batteries when either the engine is on or the coach batteries are being charged by the converter (i.e. when you have the coach plugged in or generator running).

If either the relay is frozen or the BIRD has failed you'll have both your batteries connected all the time as you have stated. Here is the service manual on a BIRD similar to what should be in your coach. It has a good troubleshooting section.

Note the Canyon Star replaced the Scottsdale in the Newmar lineup and it uses the 00-00362-000 BIRD. I had the opposite problem with my coach (the batteries were not being connected when the engine was running), that is why I know so much about it. I ended up replacing the relay with a larger 200A version.

This relay is the same one your Battery Boost switch connects to, there is no separate Battery Boost relay.

In the box you should find two relays, a larger Intellitec and a smaller one (usually White-Rodgers brand) with a wire going to the BIRD. That is the battery isolation relay. The larger Intellitec relay is the so called "Salesman switch" relay that turns off all power to the coach when you press "Store" on the control panel you also mentioned in an previous post.

I hope this helps!
__________________
Stewart, Brenda and kids
2008 Newmar Canyon Star 3410
2006 Roadtrek Versatile 210
Luv2go is offline   Reply With Quote
Old 05-18-2011, 10:51 AM   #13
Junior Member
 
lezmark's Avatar
 
Join Date: May 2011
Location: Rancho Cucamonga
Posts: 13
This looks brutal...

I think I have to cry uncle on this one. I have found it just where Luv2go (thanks for all the help by the way!) said it would be. It is VERY hard to get in to this box to work even if you remove the air cleaner box which it is behind. I know my limitations and with all those hard to reach wires (I can bearly find the screws that hold the BIRD in place let alone get in their with a tester!) and I think I just need to pay someone experienced to do this. Ouch. But its just not worth me taking a chance on.

Thanks again to all for your time and help!!!!!!!
__________________
2006 Newmar Scottsdale
Grand Cherokee GRT8TOAD !
lezmark is offline   Reply With Quote
Old 05-18-2011, 11:16 AM   #14
Senior Member
 
RJay's Avatar
 
Newmar Owners Club
Join Date: Jan 2010
Posts: 4,589
Mark,
I apologize for misleading you on where to find the isolator, since you have a Newmar I was thinking it would be in the same place as mine but I now realize yours is not a diesel.
__________________

__________________
2007 Newmar DSDP 4023
Discovery is seeing what everyone else has seen and thinking what no one else has thought.
If you want to see what man made go East; if you want to see what God made go West.
RJay 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
Battery Tender for house battery, any experience with this? troedw44 Vintage RV's 8 01-03-2011 06:10 PM
'02 Fleetwood Storm - where is my house battery charger? neo102470 Fleetwood Products Owner's Forum 4 11-16-2010 07:05 PM
House battery hook up ??? georgeblack MH-General Discussions & Problems 14 05-30-2010 04:15 PM
Powering home with Coach Generator Greg from Pittsburgh Alpine Coach Owner's Forum 16 02-28-2010 03:56 PM
Coach Batteries Not Powering Damon Challenger Coach challengerros Thor Industries Owner's Forum 6 02-11-2008 08:38 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:50 AM.


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