I never said the pink wire goes to the switch, I meant the pink wire is conected because the map light is working with the switch. Where I'm saying the pink wire goes to the switch or the switch handles positive ? is working because the switch to feed the chassis ground is able to turn on the bulb since the positive is arriving... too! Never specified where is arriving positive, just that the system is working because both poles are arriving... somehow. Just the ground from door is not, hence the reason why doesn't turn on when opening doors.

If both poles weren't arriving, the map light wouldn't work, no matter where arrives + and -. Then that also means there is nothing to check at fuse box, because + is present at map light.

many ways to say the same.