[zer0ss]

Originally Posted by 2011*Camaro*SS

Attachment 467699
Someone tell me if I have this right.

What I want to do is have the (ON/ON) switch so that if I need light I can flip it to on and when I'm done flip it back to the off (ON) position and the lights will work with my dome lights and other footwell lights.
This is the same configuration as described in the DIY - just without using a center position. You could use a SPCO - but a SPDT is perfect for this application.

I am installing these new footwell lights in my back seat and some times I need only the back lights not the front ones. So I want to be able to turn on only the back lights and when I get out all the lights in the car come on.

The problem with what you want to do is this:



Wired like this:
1 LED Front
2 DOME Power
3 LED Back
4 LED Back
5 12V Source
6 LED Front

You would have a DPDT On-On Switch (with off or you'd never have a circuit that won't kill your battery). The problem lies in it you will not have a setting for both on constant 12V power or both on dome lighting at the same time.

The closest you could do with this set up would be:
1) Front and Back LED
2) Dome Power
3) Nothing
4) Back LED
5) 12V Source
6) Front and Back LED

In the top Toggle Position you'd have 12V power to all footwells. Center position is all off, Bottom Position would be LED Dome powered with 12V applied to rear, but to accomplish this youd have to diode and have to have protection circuits (in case you turned dome on with 12V currently supplied).

The easiest way to accomplish what you want is to wire the front and rear leds in parallel (using two switches instead of one) exactly as described in this thread. You can wire to a separate 12V source to keep the load down, but I don't know of another circuit with the dimming "theater" function as the dome light.

Hope this helps.