I do not do lighted rocker switches
I do indicator lamps next to non-lighted rocker switches
Works real good.
Not the best source (I usually shop elsewhere) but Radio Shack
Here is one 12 volt (Lamp) assembly from Radio Shack,
12 volt snap in redAnd an LED version as wellTo connect:
your rocker switch has 3 terminals.. If you are using the LED version you can connect to two of them, with the switch OFF it should light
Hook two two different ones and again it should light
Hook to the remaining pair it will not light
Flip the switch and two of those pairs will change
NOTE: LED's are polarity sensitive so you need to hook up both ways
Once you ID the "Ground" pin, you can hook up more of them easily.
You get your choice of "Switch off, LED on" (Good for say the bathroom light switch) or Switch On LED ON (most other switches)