FYI, NAPA sells a setup that does that very thing. It's a 9v battery connector
wired to a cigarette lighter plug. You might recall that the cigarette lighter
circuit is active at all times, as is the lead to a radio that is intended to
hold
the presets. The primary intent of the gadget is to maintain the car's computer
programming when the battery is disconnected during service. In this case it
doesn't matter which side of the battery is disconnected (or both).
Chris Kotting wrote:
> Two things:
>
> Not disputing the point, but I was always told to put the switch on the
> ground side. What is the reason for sayng it should be on the
> non-ground?
>
> A good way to keep the radio presets from going away is to wire a VERY
> low value fast-acting in-line fuse across the switch. You open the
> switch, and power is available to keep the presets alive through the
> fuse. Anything starts drawing real power (even a dome light bulb, if
> you put in a low enough value fuse) and the fuse blows and the circuit
> is open. Another way is to have a 9 volt battery wired to a cigarette
> lighter plug. Plug that in to the cigarette lighter just before
> throwing the switch. 9 volts is enough to keep the presets alive.
>
> Chris Kotting
> ckotting@iwaynet.net
>
--
Bud Krueger
http://home.ici.net/~bkrueger/
52TD
77MGB
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