lights not working

Hey haven’t been on here in a while with the move and all. I will post updates in a few days (including meeting someone with a S code XR7G), but for now I need help with a problem. I got the '71 running but am having a problem with lights. I discovered this late last night so haven’t checked it out thourghly, but could use some help in pointing me in the right direction. When I turn on the lights, headlights is all I have. No side markers (or park lights anywhere), no taillights, no brake lights, no turn signals…just headlights. All fuses appear good and will test them when I work on it again. I did check some of the lights and the bulbs appear good. Is there a relay or something somewhere I need to check, or just start chasing wire, or…???