dash light and marker light help

[89s13silvia]

ok so i got a new tcu and went to put it in but don't think i have one....

i have a weird 12v thing that i get power going into but nothing coming out... from the looks of it it converts power to 12v or vice versa but im not sure

also there are some other plugs that i am unsure of

anyway i've attached a few pictures

sorry for so many but im trying to figure this out
any help would be great




12v thing on driver's side where the tcu would normally be



driver side





passenger side
what is that small plug hanging down with the 2 wires?

thanks again
chris