dold@howXtoXdis.usenet.us.com wrote:
>
> Tjacobs <thomas.jacobs@dva.state.wi.us> wrote:
> > I am not sure what you are talking about. Some people suggest hooking
> > a 9 volt transistor Battery accross the Car Battery terminals before
> > you disconnect the car battery. It is cuppose to give enough juice to
> > keep the presets in the radio from erasing. It may work with the anti
> > theft codes also.
>
> That might be an interesting exercise. Hooking a 9v dry cell across a
> 300Amp-capable 12v car battery ought to be a really bad thing.
>
> I've never heard of that trick, but if anything, I would think you would
> disconnect the car battery, and connect the 9v battery within X seconds.
>
> I would never connect two dissimilar voltage batteries.
>

I believe that you may have misunderstood what the respondent was referring
to. Connecting a 9v transistor battery to save the radio and clock settings
is actually a common practice although in a slightly different manner from
what was described. Most folks use an adapter that plugs into the cigarette
lighter socket, e.g., http://tinyurl.com/yctf. The only issue with this is
that you have to be careful not to turn on any accessories while working on
the car as the small 9v battery will not hold up under the load and the
radio settings will be lost.

Eric