Re: Roadmate 500 or StreetPilot 2610 with Possitive ground car
From: Peter (prathman_at_comcast.net)
Date: 08/30/04
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Date: Mon, 30 Aug 2004 14:48:33 -0700
art.mcewen@moh.gov.on.ca wrote:
> Hi,
>
> I've just started looking into auto gps's and those models seem to be
> the favourites with the features/cost for me, but I sometimes make
> trips in my 1960 Triumph TR3 which besides having no cigarette lighter
> is also positive ground.
>
> As those models don't have internal batteries is there a safe option to
> connect them to portable in-car power?
It shouldn't matter to the unit whether the two power connections are
wired to 0V and +12V or to -12V and 0V. One option is to install a
cigarette-lighter jack with the normal ground connection wired to -12V
and the normal +12V connection wired to ground. Just make sure that no
metal part of the jack (other than the -12V contact) can come in contact
with a grounded part of the car and put a fuse in the wires going to the
jack. But there's a chance that someone might try to use the jack for
something else which may have exposed metal parts connected to the
nominal ground contact (-12V in your car). That could cause a short and
blown fuse if it then touches any grounded parts of the car.
So it might be safer to use a different type of two-wire connector using
Garmin part 10495-02 to get you the bare power wires and an audio jack
(or the equivalent for the Magellan unit).
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