A basic question... Hopefully I can get suggestions...

I recently bought a '99 Ford Explorer XLT (4dr 2wd model). Anyway, I
wanted to add a toggle switch to the dash or underneath) so that I can
control something (like a fake alarm led light, like those found at Radio
Shack etc...) or I wanted to wire a device (any device) that only came on
when my head lights turned on.
Anyway, my question is... how do I wire any device to the fuse box? So I
then can connect it the a 2-prong toggle switch. Another question... (do I
connect 1 wire from the "device" to one of the prongs of the toggle switch
and another to wire from the toggle switch somehow to the fuse box???) I
am so retarded and lost. I have never wired anything in a vehicle (can
someone say pending car-fire lol!!!), so ALL help will be greatly
appreciated. Thanks in advance to everyone...
Ps. Fusebox is on side of dash console facing driverside door)

CpuVampire wrote:
> I recently bought a '99 Ford Explorer XLT (4dr 2wd model). Anyway, I
> wanted to add a toggle switch to the dash or underneath) so that I can
> control something (like a fake alarm led light, like those found at Radio
> Shack etc...) or I wanted to wire a device (any device) that only came on
> when my head lights turned on.
> Anyway, my question is... how do I wire any device to the fuse box? So I
> then can connect it the a 2-prong toggle switch. Another question... (do I
> connect 1 wire from the "device" to one of the prongs of the toggle switch
> and another to wire from the toggle switch somehow to the fuse box???) I
> am so retarded and lost. I have never wired anything in a vehicle (can
> someone say pending car-fire lol!!!), so ALL help will be greatly
> appreciated. Thanks in advance to everyone...
> Ps. Fusebox is on side of dash console facing driverside door)
>

Yes.

Fuse+++++switch+++++
|Device|
Ground--------------

Steven