Ground switching is very common in modern cars and computer controlled
systems. One obvious application on many cars is the dome light. The switch
on the door jam is a single wire switch to the car body...provides the
"ground" for the lamp.
Gordy
On Mon, 1 Nov 2010 07:33:08 -0500, Jack Feldman <qualitas.jack@gmail.com>
wrote:
> It has been an interesting thread, but a scary one. THE SWITCH MUST GO IN
> THE POSITIVE LEAD. Any electrician or Radio Amateur with kit building
> experience will tell you so.
>
> First, the fact that they don't sell negative working switches should be
a
> clue. Second, if you look at the electrical code for your house, at least
> in
> the US, you will find it is illegal to put the switch in the neutral, or
> grounded lead. The switch must always be in the hot lead. I can't speak
for
> other countries, I know they do things differently in England, but I'm
not
> sure that extends to switching the neutral.
>
> If you are adding a switch, it is easy to put an inline fuse in the
> circuit.
> The holders are inexpensive and easy to crimp of solder. Soldering being
> preferred.
>
> One person in my club added a fuse block for bladed fuses to his Buy-Eye.
I
> had a mechanic to the same for me. I bought a block with LED indicators
to
> show when the fuse is blown. The LED is in parallel to the fuse so it
only
> works on non interrupted circuits.
>
> If I sound too harsh, please accept my apology, but I would hate to have
> anyone's beloved car burn up because of improper wiring.
>
> Jack
> KA9HEL
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