Dome light/courtesy lights

I looked all around and could not see any bare wires, I think I will try a new pin switch.

Hello Fisherman
I tried the test light today on the wires that the door jam switches plug into and the result was, it appears that there is no power/current going through these wires.
The test light did not light up.
Thinking that maybe something was wrong with the test light, I tried it on the truck battery and it did light up.
When I was doing the test on the wires that the door jam switch plugs into, the fuse was in and the interior lights were on.
Do you have any other suggestions based on this information?
I'm also curious about a couple of things in your initial reply to my question.

The picture didn't upload for whatever reason.
Hopefully it does this time!

Hello Again Fisherman
If I understand correctly your instructions on how to check for a grounded wire, this is what I did and these are the results.
Using vicegrips, I attached one end of a wire to the positive post of my truck battery and then, using the clip end of the test light, I attached that to the other end of the wire.
Then using the probe end of the test light, I tested each "terminal" end of the wires that the door jam switches plug into. For the driver side, the test light lit up when the probe touched the terminal for the white wire and lit up as well for the black wire. It did not light up when it touched the brown wire terminal. I assume the brown wire is the default ground wire? On the passenger side, there are only two wires, white and black, and the test light lit up testing both of those terminals.
I then took out the fuse for the interior lights, did the same test steps and got the same results as when the fuse was in. So, do these results indicate anything to you?
To me, it just indicates that when contact with the terminals was made, it showed the charge coming from the truck battery. I don't know if that's the case or not though.
As far as the dome/courtesy switch goes, no, I haven't checked that yet. At this point I don't want to buy something that may not be the cause of the problem and not be able to return it if it isn't.
I appreciate the schematic of the wiring you sent and i'll take you up on your offer of e-mailing me the full size version.
I'll send you my e-mail address via the private message option.
Thanks for the help so far.
Paul