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Old 08-21-2021, 01:47 PM   #1
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Join Date: Sep 2015
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Dolphin chassis battery is dead

I have a 2004 Dolphin 5342. I have been plugged into shore power for 5 weeks and my chassis battery is dead. Battery is less than 2 years old. I値l pull it and have it load tested but doesn稚 it get charged when plugged in. Control panel shows house batteries at 13.6 but chassis battery is blank. Thanks for any input!
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Old 08-21-2021, 03:40 PM   #2
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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 stuck or burned up.
2007 Sea Breeze LX 8321 Ford Chassis
2004 Ford Ranger Edge
El Cajon CA.
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Old 08-21-2021, 05:13 PM   #3
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Do you know where to find that solenoid on the Dolphin and does it look like a typical starter solenoid? How would I troubleshoot it? Thanks for the reply!
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Old 08-21-2021, 11:57 PM   #4
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The interconnect solenoid, ( actually called the isolation solenoid ) is also used as the boost/aux start solenoid.

Pushing the boost switch on and off and listening for it is a way of locating it.

Once found, you measure voltage on both large terminals, to ground, while on shore power or with engine running. If its working, voltage should be the same.
Its connecting the house batteries to the chassis batteries.

All of this is IF you have the capability to charge the chassis battery thru the isolation solenoid. Many RV of that era didn't.

Just because someone said it may be that, doesn't mean he knows if yours does.
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Old 08-22-2021, 01:03 AM   #5
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Location: Horse Town USA, CA.
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This should help. The first BCC has fuses the second one has circuit breakers depending which one you have. Download all the files for your BCC.
1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat Pickup 6.0 Diesel Crew Cab DRW, 4X4, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000,1994 36ft Avion 5er, GVWR 13,700, 2,740 Pin Weight.
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battery, chassis, dolphin

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