Tail lights and dash lights do not work

HEYMAN 1104, I want to start by saying thanks for the quick reply. But I think I need to be a little more specific. I put the aftermarket radio in about three weeks to a month ago, and everything has been working well up until about three days ago. I still want to go behind my radio and look around for maybe a loose wire, because I have no burnt fuses. And I did mention that I replaced 95% of my inside and outside bulbs with LED bulbs. But that was also at the same time I installed the radio. So I am wondering if I back tracked and replaced all the LED bulbs with the original bulbs, if that may help? I am trying to remember anything and everything I tried or heard to try. One more thing is I tried to replace my glove box light with just a regular bulb since I did not have an LED to replace that one with, and it did not work. When I first tried to change it, the bulb would light up and go out, light up and go out again. So I was wondering if that could be my problem area? I heard there is a relay under the dash that could be giving me this problem. Because like I mentioned all my fuses are good not a single one is bad. Anything anyone can do to help would help me tremendously. I am a single dad and I am not rich by any means. Thanks everyone in advance. Also, I replaced the dimmer switch with like four other ones I got from my local bone yard, so I know I cannot be that. Before I replaced it, I tried to see if there was power to the switch, and no there is not. I am stumped.

My headlights are working the same as well. And all the things that you and other people I know have said. I have checked and found there to be no problems. All I have not done is changed all my bulbs back from LED to stock. I am going to tackle that job in an hour or so. I sure hope I can fix this on my own without breaking my bank account all the way. I wish it was a problem that I knew once I was done it was going to work. All these guessing games are horrible. Thanks again to any and everyone who is or will be trying to help.

Update: I got ahead of myself and when I was checking fuses with a test light, I was not checking both metal pieces that are on top of the fuse. So I did that today and found my fuse was not working (burnt) so I solved my problem. Thanks for the help HEYMAN1104. I appreciate everything you did to help!

I sure will and I hope one day I can do the same for someone else. Have a good one I appreciate the help once again.