You may have grounded the illumination wire, on my '84 it was/is a pair of grey/violet wires. The same original 2 pole connector also had a pair of red/white wires that were always hot. The keyed 12V source was a pair of black/yellow/green leads, brown is ground, antenna is blue.

You might start by finding those grey/violet wires.

Multiple problems I suspect, windows are not connected to the radio.

good luck

__________________
Bill

'82 300SD 195K
'84 300SD 199K