Tail light troubleshooter

[gmaxum]

Wonder if someone out there can take this troubleshooting to the next level.
The tail and side markers don't light. Flashers work. Brake lights work.
What I have found is that I don't even have power to the hot side of the fuse!
I would think this is where the circuit would start and all relay and switches would be 'downstream' from here.
Obviously I don't have wiring schematics, so if anyone out there in SVX land has any suggestions I would be highly appreciative.