Wiring help plz - Gen 1 light switches

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This is all I have left on wiring - the light switches... On the main switch (On-Off) I have:
Orange - Courtesy Lights?
Yellow - Dimmer??
Red - Main Power Feed
Brown - Marker Lights

On the um, 'dimmer' switch, that rolls from right to left I have:
Green - Instrument Panel Feed
Brown - ??
^ Those two run together... feed into the same pin.
White/Black - Courtesy Lights/Dome
Black - Ground
Brown - ??

The ones I know are in black, the ones that are questioned are in red... can anybody add any input on this?? I'm assuming all those brown wires are inter-connected, but can't find anything in my meager wiring diagrams...

[Mikz86TA]

Gray on GM is parking lamps but also feeds to the interior parts for their illumination. The radio will have that along with the dimmer. The Gray at the dimmer is the 12V illumination feed from the headlamp switch. The Brown is usually dimmer. Yellow is 12V ignition and Orange 12V constant. Black is Ground. White-Black will be the - Ground feed for the Courtesy lamps. That should have a Ground path when you roll the switch to turn the inside lamps on with the doors closed and will have a 12v + when its at rest. Is that clear? Lemme know if its confusing or you need more info.

[Tink]

I think I got it... just not sure how it is going to wire up to my Summit wiring harness now.

The only other thing, I assume all those Brown wires feed together?