Sounds like you are taking current through the light bulb to feed something else. This is not noticed when the light is turned on but there seems to be a feed back through that bulb to something else with the switch off.
See if there is two switches controlling that certain light like a three way switch system.
Drop the light fixture and see how many wires are connected to the black wire of hte light fixture.
Also tell me if you have a 60 amp main service panel that has a fuse block with two 60 amp fuses marked main.
Let me know the above information and we will work from there.
Curious
Wg
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