Atwood water heater electric switch

One you may have mis-wired the light
Two.. I installed an "Indicator light" (led) next to the switch way easier than a new switch.

The original switch probably had an incandescent lamp. They make that switch with an LED lamp but you might have to look closely on the package to tell them apart. The LED isn't as bright but doesn't have to be - I can tell the difference between on and off. It will last much longer too!

Was the light ever working? You need 3 connections to the lighted switch. You have the hot wire to the switch, you have the wire from the switch to the relay that turns on the 120v heating element, and you have the ground wire that is only required so the switch will light up.

If the heating element is working, then wires 1 and 2 are working. The only other possibility is the ground wire is not grounding.

(Once the switch lights up, if it is lit up ALL THE TIME, you have wires 1 and 2 reversed.)

dumb question...but you got the same lighted switch? 12 volt or 120 volt pilot light?