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03-28-2016, 01:23 PM
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#1
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Junior Member
Join Date: Mar 2016
Posts: 11
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Alternator not charging house battery
2005 Winnebago Aspect. The alternator is not charging the house batteries. I have been trying to trace the signal coming from the Ford, to no avail. The Winnebago diagrams are not clear, at least not to me. Anybody familiar with this particular circuit, please help.
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03-28-2016, 02:01 PM
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#2
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Senior Member
Join Date: Jul 2000
Location: Chicago Metro
Posts: 3,963
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look on the alternator. you should find a charging diode that has probably gone kaput.
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Rich, Ham Radio, Sport Pilot
Retired 9-1-1 Admin.
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03-28-2016, 02:08 PM
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#3
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,136
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Did it ever charge the house batteries?
Not all RV alternators charge the house batteries. Mine, for example, does not.
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2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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03-28-2016, 02:12 PM
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#4
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Member
Damon Owners Club Ford Super Duty Owner
Join Date: Jun 2011
Location: Gilbert, AZ
Posts: 64
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You might want to check the battery isolator as well.
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2004 Damon Intruder 350F/
2018 Chevy Equinox Premier Toad
Frank, Tim, Scooter & Ozzy
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03-28-2016, 02:23 PM
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#5
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Jun 2008
Location: Glendora Ca.
Posts: 1,588
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Arch, Your alternator should be charging your house batts. Mine does.
Mike
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2004 Monaco Monarch
Blueox, SMI, 1990 Wrangler YJ 
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03-28-2016, 03:20 PM
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#6
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Senior Member
Join Date: Dec 2003
Location: Motor City, Mich
Posts: 3,369
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While the images and videos are for a Class A Winnebago, this post might help.
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Tim.
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03-30-2016, 09:41 AM
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#7
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Senior Member
Winnebago Owners Club
Join Date: Apr 2003
Location: Skiatook, OK
Posts: 2,550
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wenders, check the battery isolation relay, see below.
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Grant & Pat
2014 Adventurer 35P 
2021 Ford Bronco OBX
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03-30-2016, 09:52 AM
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#8
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Senior Member
Join Date: Jul 2014
Posts: 35,402
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Quote:
Originally Posted by rk911
look on the alternator. you should find a charging diode that has probably gone kaput.
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In that year, it has a factory charging system. If it charges the start battery, there is nothing wrong with the alternator.
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03-30-2016, 09:54 AM
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#9
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Senior Member
Join Date: Jul 2014
Posts: 35,402
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Quote:
Originally Posted by Arch Hoagland
Did it ever charge the house batteries?
Not all RV alternators charge the house batteries. Mine, for example, does not.
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You should follow this post to find out why your dose not.
It has been standard equipment since probably the 70s or 80s.
The chassis manufactures include high output alternators on motor home chassis for this reason.
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03-30-2016, 09:57 AM
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#10
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Senior Member
Join Date: Jul 2014
Posts: 35,402
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There are hundreds of posts about isolator relays ( Solenoids ) failing, on this site.
They are the weak link in the "chassis to house" charging system.
Fortunately the are relatively cheap and easy to replace.
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03-31-2016, 10:46 AM
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#11
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Junior Member
Join Date: Mar 2016
Posts: 11
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Thanks for all your helpful suggestions. Indeed it was the solenoid, which picked up OK, but did not connect the 2 batteries. Problem solved, except now I noticed a rather fast discharge of the house batteries, which could or could not be a related issue. In addition I noticed an electrical smell when charging the batteries. I'll measure the discharge current and hopefully find out where it goes.
Win
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04-02-2016, 06:34 PM
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#12
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Junior Member
Join Date: Mar 2016
Posts: 11
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Actually it is a poor design to have the solenoid continuously energized while the ignition is on. There's got to be a better way.
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