Dome light trouble shooting

What model year is your car?

You can download service manuals over at MyMopar. Several of 'em came from the guys on here. If you have a map light that can complicate things.

http://www.mymopar.com/index.php?pid=31

The dome / courtesy lamp system uses non grounded bulbs. That is, the bulbs get continuous power on one terminal, and are powered on by a switched ground. Each door switch grounds the yellow wiring to activate the lamp(s). Also a yellow goes up to the light switch, which also grounds the yellow when the dimmer knob is twisted all to the left.