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 > iRV2.com COMMUNITY FORUMS > iRV2.com General Discussion
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 11-17-2021, 02:24 PM   #1
Junior Member
 
Join Date: Jan 2020
Posts: 17
House batteries not charging while driving - Class C

I have a Class C 2005 Winnebago Minnie 26a. My house/coach batteries are not charging when I am driving. I took the positive post off the batteries and tested for voltage between the positive cable and ground. There is no voltage when the engine is running. There is good voltage if the motorhome is plugged in. The battery switch left of the steering column on the drivers side doesn't make a difference whether it is in the engine or house position. I checked all of the fuses both under the hood and in the converter visually and with a VOM. One weird thing that was in the fuse block was a little black thing that looked like a fuse without any amp marking and one leg was turned 90 degrees to the other - diode? It tested negative for continuity. I boondock fairly often and use a bi-pap with a 12 volt adapter (not an inverter) so having fully charged batteries when I arrive somewhere for the night is pretty critical. BTW the batteries were new last spring and they are typical deep cycle batteries. Previously the bi-pap barely put a dent in them. I thought about running a special line from the chassis battery to the coach batteries with a diode so it would be charge only but I also realize that with the override switch from engine to house that could be a problem, not to mention the possibility of depleting the chassis battery. Any ideas?
Barsuhn 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 11-17-2021, 02:29 PM   #2
Senior Member
 
Join Date: Oct 2014
Posts: 5,408
Quote:
Originally Posted by Barsuhn View Post
I took the positive post off the batteries and tested for voltage between the positive cable and ground. There is no voltage when the engine is running.

You are VERY lucky if you did not blow the diodes in the alternator. Alternators HATE to feed an open circuit/be disconnected from the battery.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
wolfe10 is offline   Reply With Quote
Old 11-17-2021, 02:32 PM   #3
Senior Member
 
Join Date: Jul 2014
Posts: 30,412
Find the continues duty solenoid that does the battery to battery charging and see if it's getting 12 volts to the small terminal while the engine is running.

If it is getting power, then the solenoid may be bad. Very common for the internal contacts to burn up.

That solenoid will have cables from the house battery on one side and chassis on the other. It closes with the key on or when you use the switch in the cab.
That's how they work.
twinboat is offline   Reply With Quote
Old 11-17-2021, 02:35 PM   #4
Senior Member
 
Join Date: Jul 2014
Posts: 30,412
Quote:
Originally Posted by wolfe10 View Post
You are VERY lucky if you did not blow the diodes in the alternator. Alternators HATE to feed an open circuit/be disconnected from the battery.
Alternator is connected to the chassis battery. He removed the house battery cable. No harm to the alternator.
twinboat is offline   Reply With Quote
Old 11-17-2021, 02:40 PM   #5
Senior Member
 
Join Date: Oct 2014
Posts: 5,408
Quote:
Originally Posted by twinboat View Post
Alternator is connected to the chassis battery. He removed the house battery cable. No harm to the alternator.

Hopefully you are correct and I misunderstood what he said.


He said: "I took the positive post off the batteries and tested for voltage between the positive cable and ground."
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
wolfe10 is offline   Reply With Quote
Old 11-17-2021, 09:17 PM   #6
Senior Member
 
Join Date: Apr 2015
Location: Littleton, Co
Posts: 129
Blog Entries: 1
Coach batteries

My Lazy Daze 2003 was equipped with an isolator mounted up under dash. This will have a connection from your alternator into it and a connection going back to house batteries. I would check the terminal in for voltage with engine running and check connection going out to the coach batteries. Provided you have this set up. Isolators can go bad. Travato John
jl.kauai is offline   Reply With Quote
Old 11-18-2021, 09:53 AM   #7
Junior Member
 
Join Date: Jan 2020
Posts: 17
By batteries I meant the two six volt deep cycle batteries not the chassis battery. Your comment though is a good reminder about protecting the alternator by having a load present.
Barsuhn is offline   Reply With Quote
Old 11-19-2021, 06:34 AM   #8
Senior Member
 
DRM901's Avatar
 
Tiffin Owners Club
Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 1,131
I suspect you need to install/replace a BIRD (bidirectional relay). I just purchased one from Blue Sea (ML-ACR) to replace the Magnum one that died soon after I installed it.
__________________
2014 Tiffin Allegro Bus 37AP
DRM901 is offline   Reply With Quote
Old 11-21-2021, 08:55 PM   #9
Member
 
Join Date: Oct 2018
Posts: 47
I have a 1999 FW Discovery Pusher and had the same issue. I could not trace it. Took it to RV shop. They knew the system and found that the control panel had a failure, were able to correct it by making a simple jumper. Worked great last couple years. If you'd like a picture, I can add one upon request...
Jim
Hoof-hearted is offline   Reply With Quote
Old 11-22-2021, 05:54 AM   #10
Senior Member
 
Join Date: Jul 2014
Posts: 30,412
The OP has a class C, not a Diesel Pusher.

DPs use different systems, because of the large difference in chassis and house battery bank sizes.
twinboat is offline   Reply With Quote
Old 11-27-2021, 06:08 PM   #11
Senior Member
 
Join Date: Apr 2015
Location: Littleton, Co
Posts: 129
Blog Entries: 1
Batteries not charging

Just curious if you were able to find out if you have a battery isolator or were able to find out the problem. Travato John
jl.kauai is offline   Reply With Quote
Old 11-28-2021, 04:51 PM   #12
Junior Member
 
Join Date: Jan 2020
Posts: 17
I am having it professionally serviced on 12/6 and will post what I find out. The more I read the more I realized this was beyond my skills.
Barsuhn is offline   Reply With Quote
Reply

Tags
batteries, charging, class c, house 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
House Batteries Not Charging while driving? UPDATED 3/15/06 Old Snipe Winnebago Industries Owner's Forum 15 04-28-2017 09:29 AM
2013 HR Vacationer not charging house batteries while driving. CoastieChief Monaco Owner's Forum 13 05-06-2014 07:44 AM
House batteries not charging while driving bobpie Winnebago Industries Owner's Forum 20 08-04-2013 04:01 PM
House batteries not charging while driving coach embmac Winnebago Industries Owner's Forum 2 06-28-2010 08:43 AM
House Batteries not charging while driving? dhrt05 MH-General Discussions & Problems 7 06-05-2006 06:01 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 12:53 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.