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Old 05-10-2020, 04:31 PM   #1
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Chassis batteries

What charges the chassis batteries besides the alternator on a 2006 western RV alpine Limited. without the engine running we are not charging the chassis batteries. House batteries are charging fine on the inverter.
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Old 05-10-2020, 05:39 PM   #2
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Most coaches that age have a device linking the batteries that starts filling one side after the other side is full. Our 2008 National does that. It should say in the manual if you have one. After some time in a campground do your chassis batteries measure full? If so you do.
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Old 05-10-2020, 06:10 PM   #3
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My Alpine Coach has a Xantex 2000 Echo charger that keeps the chassis and house batteries topped off. The unit is located in the compartment with the inverter. It had a red wire for the house batteries, a striped wire for the chassis batteries, and a ground wire. When I bought my coach, I was having battery issues and investigation found that the 2 charger wires were reversed.

http://www.xantrex.com/documents/Acc...204-01-01).pdf
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Old 05-10-2020, 06:48 PM   #4
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The short answer is your inverter can charge your chassis batteries when it has 120v power from shore power plugged in or your generator running. The key is that priority is given to charging the house batteries first. This priority is controlled by your Vansco system.
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Old 05-10-2020, 07:47 PM   #5
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Adding to what Carter said--your 2006 uses an electronic comm. system[Vansco] with firmware to control chassis bat charging while on shore power/genset... The Vansco system controls a solenoid that connects your two bat banks when certain parameters are met....On newer Alpines, the solenoid can fail--use the bat boost button on the dash to test the solenoid....Resetting the Vansco [shut off chassis bat switch for a few minutes] may clear the issue but most likely the solenoid has failed....
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Old 05-11-2020, 11:53 AM   #6
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IIRC it is led #19 on your rear Vansco, if it is on you are charging your chassis batteries. Fellow Alpiners, keep me honest, is this correct?
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Old 05-11-2020, 12:40 PM   #7
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Mostly yes. My light would come on, but my solenoid wouldn't flow any amperage. That was the second repair on mine after the first trip.
They are readily available for about $50.
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IIRC it is led #19 on your rear Vansco, if it is on you are charging your chassis batteries. Fellow Alpiners, keep me honest, is this correct?
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Old 05-11-2020, 11:02 PM   #8
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Sticker with key to LEDs

I'm not sure it's 100% accurate, but attached inside of the curved under-dash panel is this sticker, showing F and R Vansco inputs/outputs, pin diagrams, and a PDM block diagram.
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Originally Posted by DrDaveMA View Post
IIRC it is led #19 on your rear Vansco, if it is on you are charging your chassis batteries.....is this correct?
On 'my' sticker, output #19 is "TRANS 154,161".
Rear #8 and #9 are ISO LED and alarm, resp. I see no labels that would indicate battery charging..



A great tool is using search, with 'f104 'included to eliminate non-WRV threads.
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Old 05-12-2020, 08:21 AM   #9
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Rear VMM outputs show 19a as 12V, 19b as Battery interconnect.
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File Type: pdf 2005 VMM-PDM Schematic.pdf (328.8 KB, 4 views)
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Old 05-12-2020, 10:52 AM   #10
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Quote:
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Rear VMM outputs show 19a as 12V, 19b as Battery interconnect.
Thanks, further explains:
--there are wiring variations in the coaches, which I knew but made troubleshooting a driving light problem quite lengthy. I found a difference between 'my' diagram's indication of which in/output LED should light and the reality of activating the switch; hence my comment about possible incorrect reference to the posted diagram.


I found I need to be real careful in using various threads, as earlier models have numerour variations from ours, and postings aren't always clear which coach the post refers to.
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