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.
  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 09-08-2015, 03:05 PM   #1
Senior Member
Join Date: Apr 2015
Posts: 118
Alternator charging all batteries?

I wish I could find the thread, but ran across a posting recently that mentioned that the engine alternator does not charge the house batteries and never has. I So my newbie question is, does the engine alternator typically charge the house batteries on a Class A, both diesel and gas models or is that left up to shore power or generator thru a charger? I thought this was odd since the diesel engine alternator in my sailboat charges both the house and start batteries thru a combiner or battery select switch. Thanks!

StephenW 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 09-08-2015, 03:16 PM   #2
Senior Member
lllkrob's Avatar
Join Date: Nov 2008
Posts: 1,825
Every Class A that I have seen charges the chassis and coach batteries while the engine is running.

2013 Tiffin Phaeton 40QBH
2016 Chevrolet Equinox LTZ AWD V6
lllkrob is offline   Reply With Quote
Old 09-08-2015, 03:28 PM   #3
Senior Member
Join Date: Mar 2011
Posts: 479
Yes, your engine alternator does charge the house batteries. On our Discovery we once had a bad, corroded post between the engine alternator and the engine and house batteries. Both were suffering from low voltage as we traveled. A Cummins teck found the bad post, cleaned the post, and we then saw proper charging to the house and engine batteries. Used our coach electrical panel gauges to help solve this problem.
JBDISCOVERY is offline   Reply With Quote
Old 09-08-2015, 03:57 PM   #4
"Formerly Diplomat Don"
Dutch Star Don's Avatar
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 10,122
"StephenW".......If everything is working as designed, both battery banks should be charging. The charging system looks at both banks and charges the lowest, alternating back and forth.

What you may have heard......many RV's, when plugged in, only charge the house bank. Many newer coaches have resolved that issue and charge both. On my last coach, I had to add a supplemental system to charge my chassis batteries when parked.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
Dutch Star Don is offline   Reply With Quote
Old 09-10-2015, 12:22 PM   #5
Senior Member
FreedomDream's Avatar
Join Date: Aug 2012
Location: fulltiming
Posts: 294
Yes, as others have said, your engine alternator will charge both battery banks. There is a delay from when you start your engine and when the solenoid kicks in and starts charging. There is also a solenoid that ties in the coach batteries. It is possible that if that solenoid switch fails, the coach batteries will not get charged.
Bob & Joan Alexander, 2010 Tiffin Phaeton 36 QSH, 2013 Jeep Wrangler (toad)
Lobo & Juniper (woof, woof)
FreedomDream is offline   Reply With Quote

alternator, batteries, charging

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
Damon Challenger 372W House Batteries Don't Charge WiSchmidtFam Class A Motorhome Discussions 9 07-09-2015 08:14 AM
Need your advice. House batteries not charging on shore power or generator UtahRv Class C Motorhome Discussions 11 06-14-2015 10:39 PM
Starting Batteries Joedean Class A Motorhome Discussions 6 12-12-2014 01:21 PM
House Batteries cooked on us! RV1597 RV Systems & Appliances 13 07-05-2014 01:26 PM
House batteries making buzzing noise Furniss Class A Motorhome Discussions 10 06-21-2014 10:46 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:42 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.