Dorikato

Alright, so I'm tearing my hair out here trying to figure this out. I have NO cluster illumination (besides dummy lights, clock, high beam & turn signal dash indicators) nor do I have DRLs, headlights and BRAKE lights work, as well as my reverse lights. I've tried 3 different TCU boxes, 2 different light switches (stalk/multi function switches), and two different dimmer switches. No blown fuses, replaced them ALL just to be sure. The ONLY way I can get gauge cluster illumination is to feed 12v to the red/yellow wire that is attached to the dimmer switch. I've tried grounding the red/yellow etc to bypass it with no luck. I'm fine with running it that way, but it still does not solve my DRLs not coming on at all.

Any insight into what could be the problem?!