Interior lighting lights…

The interior light on my 1971 Plymouth Fury III won't go out... I replaced the thermal time relay because the old one was very oxidized.

I then wanted to replace the bulbs. Previously there were none. Now the light sources shine continuously.
There are two contacts in the socket. One has 12V. For the other 0 V. How do you turn on the interior lighting?
Should the lights turn off at some point?

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I found an empty port. What would belong in there?

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Author: BE_Fury