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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > Engine batteries not charging

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jaycocamper62301

Illinois

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Posted: 04/14/19 06:54pm Link  |  Quote  |  Print  |  Notify Moderator

I have my 2006 Bounder 37U here at home in my shop and has been hooked up to shore power since Wednesday. House batteries are charging and chassis batteries are not. Now the RV won't start. Where do I start. I have a Big Boy battery isolator ad it has 13.4 volts on one post and 11.5 on the other. All interstate batteries are 2 years old

enblethen

Moses Lake, WA

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Posted: 04/14/19 07:05pm Link  |  Quote  |  Print  |  Notify Moderator

Do you have a "aux" start button on the dash? It is a momemtary rocker. Pushing it should allow to start the rig off the coach batteries.
Many rigs do not charge the chassis battery from shore power. I put a small charger on the chassis battery to keep it up.


Bud
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jaycocamper62301

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Posted: 04/14/19 07:25pm Link  |  Quote  |  Print  |  Notify Moderator

Aux switch did not help the starter one bit

enblethen

Moses Lake, WA

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Posted: 04/14/19 07:33pm Link  |  Quote  |  Print  |  Notify Moderator

Did you hear a load click when you pressed the switch? No, would mean no power to it. Locate your battery control center and check for the aux start fuse.
The aux start relay on many are the same one for charging coach battery from the chassis alternator.

RLS7201

Beautyful Downtown Gladstone, MO

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Posted: 04/14/19 07:45pm Link  |  Quote  |  Print  |  Notify Moderator

Close to the two battery banks is a black box called a Battery Control Center (BCC), manufactured by RV Custom Products. In the BCC, behind the circuit board, is the isolator relay. It's the silver one. It's probably your problem. On the back side of the BCC cover is a wiring print, that shows how the isolator relay connects the two battery banks together when either battery bank reaches 13.2 volts. Your coach DOES charge the chassis battery when plugged in. Advice about your charging system from non Fleetwood owners is usually incorrect.

Richard


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jaycocamper62301

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Posted: 04/14/19 08:08pm Link  |  Quote  |  Print  |  Notify Moderator

yes i remember see that exact box you described

enblethen

Moses Lake, WA

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Posted: 04/14/19 08:18pm Link  |  Quote  |  Print  |  Notify Moderator

The cover should show the fuses and their function.

jaycocamper62301

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Posted: 04/14/19 09:08pm Link  |  Quote  |  Print  |  Notify Moderator

RLS7201 wrote:

Close to the two battery banks is a black box called a Battery Control Center (BCC), manufactured by RV Custom Products. In the BCC, behind the circuit board, is the isolator relay. It's the silver one. It's probably your problem. On the back side of the BCC cover is a wiring print, that shows how the isolator relay connects the two battery banks together when either battery bank reaches 13.2 volts. Your coach DOES charge the chassis battery when plugged in. Advice about your charging system from non Fleetwood owners is usually incorrect.

Richard


so you're saying take the entire fuse panel out because there is no isolator relay there

jaycocamper62301

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Posted: 04/14/19 09:09pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

The cover should show the fuses and their function.


the cover explains nothing

pianotuna

Regina, SK, Canada

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Posted: 04/14/19 10:15pm Link  |  Quote  |  Print  |  Notify Moderator

I would jumper around the isolator device. That may help to trouble shoot where the problem is.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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