Interior lights master switch

I owned a 2003 F250 that had a master switch to turn on all of the interior lights at any time at the same time. I was wondering if there was a fuze or wire I could tap into to make this happen as well as make the interior lights still work as normal.

 

You would have to surgically place wires on the ground side of each map bulb between the bulb and map light switch. The map light switch provides the ground for the circuit. You would need to do the same on the dome light circuit. The master switch would control the ground side for both circuits.

 

That makes sense and seems like quite a bit of work haha Thank you!

 

Unfortunately Toyota didn't make it easy on this one