LunaticScientist t1_jad09fk wrote
Sounds like you've got a Chicago 3-way setup. Especially since it's an older house, literally in Chicago. It can be used for non-3-way stuff, but this was most common for a jumped/shared neutral.
The issue with your switch is that it relies on a dedicated ground and neutral circuit (which you don't have). Had this problem in my 1950s house until that circuit was rewired to modern standards.
Simple solution: skip the illuminated switch.
tob007 t1_jad8f7o wrote
think it isI called Carter switching as well. Lots of old school ways to do 3-ways.
In some parts of Europe all switches work on the neutrals.
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