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Fleetwood southwind mark from england 2-28-13  
Hi i have a 1995 fleetwood southwind 34 foot chevy petrol,i seem to have some kind of battery drain?all three 12volt batterys have been charged and tested,new alternator,when you start it up the volt meter on the dash only shows about 10volts,the engine runs a bit lumpy untill you press the aux button then it shows 13ish volts and runs fine and the lights inside get brighter,without the engine or genny running the inside lights etc last no time maybe a few hours and the batterys are flat..... HELP
Re: fleetwood southwind BUBBA THE BUS TECH 2-28-13  
You have at least two issues.

If it starts and runs but the voltage does not rise you have a charging issue.

The start battery and the house batteries are most often mounted in two diferent locations.

When you start the engine the alternator is suposed to charge all the batteries through an "Isolator"

Depending on what isolator it can be signaled from the alternator to tie the batteries together for charging.

Or it can be a fancy diode pack and allow power to the batteries, and to not allow the batteries to crossfeed.

The buton you push is a manual isolator bypass. It will allow all the batteries to share power. Depending on the unit it can be called AUX Battery or internal boost or even weirder stuff.

So the underlying problems are you have a dead chassis battery and a charging system that does not work.

Where the chassis battery is mounted in your unit varies, and I have no Idea.

Good Luck
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