Multiple lighting issues

[Big d 99 silverado]

 have a 99 silverado currently my headlights stay on all the time when the key is on as do the top light on the tail light (it has the 04style breaklight and distribution board) when I hit the breaks the top light gets brighter as it should but no other break lights light up. The driving lights do not turn on (even in drive) the left turn indicator light on my dash is always on solid when i try the left turn signal it does not work when I try the right turn signal the indicator on dash works but no turn signal light on exterior works my reverse lights also dont work. I have replaced rear distribution board, rear harness, new multifunction switch, new dimmer switch, tried a diffrent bcm, new relays, new light bulbs, also redid all 3 chassis grounds.

[riverbanks]

Yikes,try pulling fuses, somebody is backfeeding

[Ak_grown]

have you replaced the bulbs? are they the correct bulbs? maybe they are not seated. with all the replaced parts sound like it might be something simple. anything aftermarket installed? radio? remote start? aux lighting?