The dome light is switched on the ground side. One of the wires to one of the switches is grounding to the frame or body.
There is a ground to each of:
Right door switch
Left door switch
Light switch dimmer
if it is a four door (non US), each rear door
If you have a cargo light, possibly through the cargo (outside) light wiring (parallel wired light)
One of these ground wires is worn/exposed/pinched and grounding to body. Any ground between the dome light and one of the switches could be the cause.
Now I feel like an idiot it was the dimmer switch (didn't even know I one). But hey now I shouldn't have any dome light failure for a long time to come.
I have had that switch stay on even when turning the knob the contacts were rusted shut. At least you can laugh at yourself I am sure we all have had a case of the Duhhh did I do that.
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