I saw the instructions to do this on the 150 -- but would
like to know about the F350. (2003)

The manual says that you can turn the interior light dimmer
downward past a detent and the interior lights should go
off. (My 2003 Explorer does this). However, the dealer
has confirmed that this is a misprint.

The fuse layout in the manual doesn't specifically call out
the interior lights -- unless I missed it, and I think there
are two fuses. (I only do this every once in a while when
I am out using the telescope and want to keep the lights
off) -- so I would be willing to pull a fuse or put a switch
in series with the fuse.

Thanks a lot for the help
F350 -2003 4WD
Steve