2002 Dodge Durango Drivers side brake and reverse lights no

Hi, thank you for letting me ask. We have replaced both of the light bulbs and even switched the entire socket with the passenger side and it is still not working. The bulbs function properly as tail lights but do not work otherwise. I also checked the fuse panel on the dash but all fuses are good. What else can I check to make this work?



**** Problem solved! Thank you for the advice, before I had the chance to get out the tester I noticed a completely sliced dark blue wire which ended up to be the ground. I spliced it back together and replaced the reverse light and Waallaah- it works! Thank you again for your time!