1994 S-10 Dome lamp/Mirror Wiring problem

1994 s-10 purchased used. Had a bad rear view mirror switch so I replaced it. First time using the new switch, it too went bad. I check the power and I am getting power from what appears to be 2
sources. This would be on the orange wire to the switch. I say this because if I pull the fuse for the mirror switch, the continuity light continues to light. If I also pull the courtesy light fuse the probe light goes out.
After spending lots of time on this, I have also discovered that when doors are closed the dome lamp glows, but it is dim. If I pull the dome lamp bulb, the problem goes away, and each fuse acts correctly.
The truck does not have DRL, and I have replaced the mirror switch, the third brake light, the door jamb switches, the headlight switch, and the dimmer switch, with brand new GM parts.
I did pull the door panels, as well as the accordions from the doors to the pillar and saw no cracked, broken or stripped wires. When I look at the schematics, I don't see where these two circuits cross paths. Assuming I want the dome lamp to work correctly, anyone out there have any ideas where to look for the problem?
Thanks in advance!
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