OK, I will bite, why is only a ground switched circuit "safe"?
On production cars most non-computer controlled circuits are power
switched. Computer controlled circuits such as injectors, idle motors, etc,
may be either ground switched (pull down circuit) or power switched (pull up
circuit)
Ford uses (or at least used to) use pull up circuits on their fuel injection
systems
Bosch uses pull down circuits on theirs.
Why is ground switched better?
Inquiring minds want to know.
Rick
On Sat, Oct 30, 2010 at 9:23 PM, Alan Seigrist <healey.nut@gmail.com> wrote:
> All -
>
> I have always wanted to use illuminated switches for my various auxiliary
> items (the ones that light up when something is on), but they are all wired
> to only work with a power-switched circuit rather than a ground-switched
> circuit.
>
> This is a major pain in the a** because if you want to do safe switching in
> a car, you should use ground-switch circuits.
>
> Do any of you know of illuminated switches around that will work with a
> grounding switch? I can run a separate power wire from somewhere behind
> the
> dash if necessary.
>
> Ideas?
>
> Alan
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