No dash lights

Look at this. I think it would match pretty close to your set-up.

If you unplug the pink jumper from the red then +12V should be removed from one side of the map lamp.

The other side of the lamp is the ground side. If the lamp still glows with pink jumper unplugged from the Big red then something else must be spliced into the Pink wires.

Your post started as a repaint re-assembly but you failed to mention the new radio. What else may have been done?