When I turn my headlights on, I don't get any sidemarkers, corner lights or tail lights.

My headlingts and brakelights work, however.

How are these 3 lights connected? I have checked all the fuses that seem applicable... which fuses and relays correspond to these lights?

 

Sounds like you burned out the parking light circuit. Check the fuses under the dash and under the hood.

 

There is a fuse in the driver's knee bolster that blew on me, its # 5 (tail l.)