2001 Chevy S-10 turn signal

Just today I was driving and went to use my turn signal and heard that one was out. So I found out which one and went to the store and bought a replacement bulb. I went to put the replacement bulb in and try it out but nothing happened. My dad came to help me and neither the turn signal nor the brake light work on the rear passanger side. We tried to test it with an electrical tester but could not get any readings. If you could please let me know what is going on I would greatly appreciate it. Thank you!