Lighting problem

Ok, here it goes.
I have s 1998 taco 2.4 5 speed. Truck is clean n solid truck, but i have a lighting issue.
During the day when i hit the brakes the brake lights come on, along with my dash n front running lights (all other lights work fine, back ups n turn signals)
At night with headlights or running lights on my brake lights burn all the time.
There has to be a common ground or component to cause this, but this is my 1st taco so still learning.
Here's a list of the things i have tried so far.
Removed n inspected rear tail lights
(Everything is good there)
I have swapped out the following parts to no avail, turn signal switch, brake light switch, intergation relay, fusebox,tail light assemblies.
There is an aftermarket radio in the truck but as far as i can tell its not in the lighting system. (Even tho heat a/c background lights dont work ether, but i havent checked those lights yet)
I keep finding partial wiring diagrams, so i can't figure out any overlaps in the wiring.
Any help would be a great help
Thanks out front
Buzz