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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.

https://youtu.be/qjOth4dnMxo

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.

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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.

3