Good Sam Club Open Roads Forum: Class A Motorhomes: Dead batteries
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Southeast Michigan

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Joined: 10/09/2011

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Posted: 05/06/21 10:11am Link  |  Quote  |  Print  |  Notify Moderator


As said, try to jump start it, but don't plan to idle the main engine long enough to recharge either the chassis or the house banks. Nothing good happens to an idling engine.

As soon as you can, start the APU (on board generator) and use that to charge the house bank. While that is happening, find out how to cross link the house to the main engine battery and use your existing converter/charger to charge that as well. Be ready, as dead as they may be, they may take a day to recover. They also may not recover. I have some dead AGMs in my shop right now that have not recovered. I have been trying for a while. It's a total **** shoot.

You will have to do the full diagnostic to know what you have to replace.


Matt & Mary Colie
A sailor, his bride and their black dogs going to see some dry places that have Geocaches in a coach made the year we married.


Wentzville, Mo.

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Joined: 05/02/2007

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Posted: 05/06/21 10:40am Link  |  Quote  |  Print  |  Notify Moderator

If your Sunova is like my 2003, you won't be able to start the generator until you have a charge on the house batteries. I should also ask if you checked the house batteries disconnect switch. It should be on the left of the entry door. If the batteries are disconnected it will seem like they are dead.

Mike & Linda Finnerty with Finn & Rosco (Golden mix brothers)


The West


Joined: 01/26/2004

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Posted: 05/06/21 04:10pm Link  |  Quote  |  Print  |  Notify Moderator

You should be able to jump your generator too. Don't connect to the batteries though, connect to the gen itself. Pos to the pos input on the gen and neg to the gen's chassis. At least that's what I've done on my Onan.

2014 RAM 3500 Diesel 4x4 Dually long bed. AISIN trans & 4.10 rear. B&W RVK3600 hitch • 2015 Crossroads Elevation Homestead Toy Hauler ("The Taj Mahauler") • Hooligan #3

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Wherever I happen to park

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Joined: 07/04/2006

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Posted: 05/06/21 04:32pm Link  |  Quote  |  Print  |  Notify Moderator

Oh for 90 bucks Horrible Freight (Might even be cheaper) has a nice small 450 Amp Lithium battery
Click here to see it

And for 75 NAPA has a 1,000 amp lead acid (heavy) one
Again click here

Fully charge the battery

Go to the generator. the actual generator Find the RED lug with the 12 volt line hook the RED cable to it.

Hook the Black cable to any handy Generator FRAME part

Start the Generator

Leave the battery hooked up for at least 1 minute or till you hear the Transfer switch or the Generator load down as the Transfer switch engages.

Make sure the Generator breaker does not trip.. then unhook the battery

Wait a while

Try to start it

Oh you will likely need a new Chassis battery.. House batteries depends GC-2 MIGHT recover.. MARINE/deep cycle will need replacement.

Home is where I park it.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times

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