Go to an electronics store.. The kind of store where "Joe's Television" might shop.
(For me it's RSE ELectroincs on Schoolcraft near Wayne Rd in Livonia, MI)
They should have a basket full of "indicator lamp assemblies" This is a quarter inch white plastic tube with a colored cap on one end, separated from the white tube by a washer, generally silver in color. The other end of the tube will have two wires coming out of it, red and black or red and white., and it will be labeled 12vdc. (on the white tube)
you also need some speed nuts (Basket or jar nest to the one with the indicators)
A spool of wire (Actually 2, one red, the other black or white matching the indicators)
Wire nuts and/or Electrical tape,, If you know how to solder, that's an option as well or heat shrink tubing instead of tape/nuts.
Now, to use...
For 12 volt switches:
Using the indicator assembly hook it across the switch, one way it will light up. mark the switch or hook a red wire (Tie a bit of red wire) to the terminal the RED wire is touching.
To mount the indicator.. If needed use the red and black or white wire from the spool along with wire nuts tape or heat shrink tubing to "Extend" the leads on the indicator, Drill a quarter inch hole where you can get to the back of it near the switch.
Shove the leads through the hole, then through one of the "Speed nuts" then shove the assembly's tube into the hole, and into the nut, sliding the nut up till it is snug. Hook the leads to the switch, Red wire goes to the lead you put red on.
Switch on, controlled light on, Indicator off, Switch off, indicator comes on. Like magic. You now have a "Spotting lamp" next to the switch.
If the switch is a 120 volt AC switch... Different tub at the electroincs store, the leads will generally be black and black, and the tube will be marked 120vac.
The 120 volt is a NEON lamp with resistor, the 12 volt LED with resistor, in both cases you need no knowledge of electroincs nor do you need to do math, it's all done at the factory.
I buy those (both kinds) by the dozen.
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Home is where I park it!
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