1993 Oldsmobile Cutlass please help

Turn yoiur light on and with a test light. Make sure you have a good ground. Probe the plugs where the lights go or the wires and see if you have any power going back to the light sockets themselves. If you do then somewhere you have a break in the ground for that light hhousing. That is where I would start let me know what you find. Thanks Hope this helps Curt