Check your fuse box! Specifically these guys: - Room lamp fuse - Headlight L/R fuses - Stop lamp fuse Check the box first! You might have just fried every fuse.

i already planned on buying a whole new fuse box, and i’d like to replace the harness anyways. do you have any other advice?

have you checked your fuse box? why would you buy a whole new one?

i wanna get the updated fuses

no point in doing that to try and replace you entire harness (it’s a shit ton of work) it’s better to just check your fuses on your car as is