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Old 05-15-2020, 02:19 PM   #1
Five92's Avatar
National RV Owners Club
Join Date: Jul 2010
Location: Kent, WA
Posts: 43
Help with battery charging

I am guessing this has been addressed before, but after a few days of searching the forums I canít find what Iím looking for.

My issue:

My coach batteries will not charge with the engine running. They do charge when on shore and generator power.

My chassis battery charges at 14.2 it an idle - coach batteries are at 12.7.

I have a 2004 Seabreeze 8341LX - workhorse chassis. Only 11,000 miles.

There has to be a relay somewhere that is not working.

Things Iíve checked.
  • Checked for burned wires in transfer switch box.
  • Checked for tripped breakers in the service panel
  • Checked circuit breakers and wiring in the 12v Distribution panel
  • Check coach and chassis battery voltage while plugged into shore power
  • checked battery voltage while engine running and unplugged from shore power.
Again - Iím thinking it must be something simple - Iím a well accomplished mechanic - but some of this stuff is hidden and finding circuit diagrams is like seeing a mermaid.

Coach and chassis batteries are brand new.

Thanks for the help
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Old 05-15-2020, 02:36 PM   #2
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Richard S.'s Avatar
National RV Owners Club
Ford Super Duty Owner
Join Date: May 2007
Location: El Cajon CA
Posts: 2,084
Sounds like your interconnect solenoid is not working.
link below has information that may help you.
2007 Sea Breeze LX 8321 Ford Chassis
2004 Ford Ranger Edge
El Cajon CA.
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Old 05-15-2020, 02:39 PM   #3
Senior Member
Join Date: Jul 2014
Posts: 28,993
If you have a boost start switch, push it on and off. If you hear a solenoid clunking, that's the one that's bad. It serves dual duty with a charging solenoid.

They clunk but don't make contact internally. Very common problem.
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Old 05-16-2020, 07:59 PM   #4
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Ray Lenning's Avatar
National RV Owners Club
Join Date: Sep 2018
Posts: 133
Google 111979 battery control center . You will find a trouble shooting guide for the charging system .
Ray & Melinda
2005 National Dolphin 5355 (MEPAW) , Koni FDS shocks, Safe-T-Plus , Rear track bar , Sumo springs . She tows a 2006 Tacoma 4X4
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Old 05-16-2020, 11:38 PM   #5
Five92's Avatar
National RV Owners Club
Join Date: Jul 2010
Location: Kent, WA
Posts: 43
Thank you all for helping! I have lots of information to Use now!
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battery, charging

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