Brent Mahon

I have no tail lights on my flatbed. I have reverse and turn signain the back and lights in the front of the truck. They are LED. I took to the local shop who is supposed to be good at wiring issues. They said it was the TIPM. I Took it to dealership (never have had good service but only one around). They said I had power to back of th truck so wasn't TIPM but wanted to charge me to drop the fuel tank to look into anymore. So I decided to do it. I can't find that it does hav power to the back of the truck. Also fuse #m17,m18,m22,m23 has no power. Is there a big fuse that all of theses are connected too? I'm looking for any ideas or steps to take to move forward. Any help will be much appreciated.