Perhaps the battery is aging?  Wouldn't it act as a huge capacitor 
across the output of the charger and operhaps its capacity is 
declining due to age; boy does that strike close to home!
Pat, K9JAUAt 08:09 PM 5/14/2012, you wrote:
>Tom,
>
>I haven't been on this list very long, however, I believe you have had this
>RV for a while.  If this is the case, is this the first time the noise has
>appeared?  If so, what has changed?  Did you have the noise before?
>
>I know, a lot of questions.  Just trying to get the facts!
>
>73's
>
>Howard #3
>
>----- Original Message -----
>From: "Tom Behler" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Monday, May 14, 2012 6:53 PM
>Subject: Getting rid of hash caused by battery charging unit in RV
>
>
> > Hi, all.
> >
> > I know we have discussed similar topics before, but I have an issue in my
> > RV
> > that is now affecting my HF set-up big-time.
> >
> > Specifically, there is a built-in charging unit for the house battery that
> > seems to be creating more and more interference on the HF frequencies.
> > The
> > interference occurs when the charger is in either the "use" or "store"
> > mode.
> > I know that the charger is causing the interference, since when I switch
> > from "use" to "store
> > ", the interference goes away for a few minutes, until the charger re-sets
> > itself, after which time, it gradually returns.
> >
> > When we unplug the RV from the electrical service at our camp site, the
> > interference disappears completely.
> >
> > As far as I know, since the charger is directly wired into the RV, there
> > is
> > no way to turn it completely off.
> >
> > Does anyone have any simple remedies for me to try in order to get rid of,
> > or at least lessen this interference.  It is so bad that it makes the
> > 40-meter band unusable, which is why I was not on Saturday's round table.
> > 20 meters isn't much better either, which is rather discouraging.
> >
> > 73 from Tom Behler: KB8TYJ