I am having trouble with my 10A tail light fuse. It blows when headlights are on

What is your question?

I recently discovered my tail lights are not turning on when I turn on my headlights. The 10A fuse keeps blowing every time turn the headlight switch. I have replaced the turn signal switch but I am still having problems with the fuse. I have checked all the wires in the trunk and they are in good condition. I have replaced all the bulbs for the brake lights as well but to no avail. What am I missing? I have failed my inspection and don't want to continue driving this way.