Bypassing Factory Headlight/Dimmer Switch

[clapage6]

Hi all,

Currently in the process of fixing up my new toy hauler : 83 K30 CC Dually originally a 6.2 but converted to 454 which is possibly where some of their wiring problems started, bulk head connector at the fire wall looks pretty melted looking from the engine bay as well. BUT seems to work mostly...

It had some wiring problems when i acquired it so I'm doing my best to just negate those problems by bypassing a few things . One being the headlight/dimmer switch. The switch itself and it's connector + maybe 2inches of wire back from the connector were all melted and no lights worked etc.

In order to get it home originally I just got that out and threw a fused toggle switch in for the headlights/brake/running lights.

Right now I just need to get the dash lights working mainly, dome light would be awesome as well... I tried looking threw some wiring diagrams and idk if I'm just not smart enough or what but i can't seem to figure out exactly how my remaining wires work, ie: what should/shouldn't have 12v and what should/shouldn't get ground to complete which circuit.

The wires I have left:
2 orange wires which splice into each other.
1 yellow wire.
1 white wire.

What doesn't work:
High Beams
Dome Light
Dash/gauge Lights.

Any help or insight into those 3 circuits/wire colors would be an amazing help! Sorry for the lengthy post