I have a lighted toggle switch that has three prongs on the back of it, but I am not sure what goes where. Obviously two of them are just inline with the positive wire, and the third is either ground or positive for the light. I just don't know which it is, and which prong is for what. The bottom has them numbered 1, 2, 3. One of the outside ones (1 or 3) has a - and a + next to it. But none of the other two prongs have any writing, other than the number. I searched and couldn't find any info. I just want it to light up when the switch is on and have the light off when the switch is off. I am using the switch to arm my nitrous.