[McDoo]

You have power to the blinker but no power
to the tail light and I assume you have the same condition
going to the front turn signal...Is there a center conductor
in the wire ??? If not that is your problem or you have an open somewhere. How about running a jumper wire from
the blinker to one of the lights and see if it works. I don't have my SPF wiring diagram since I gave it to my roofer.
As was mentioned, join SCOF as those guys are still fun, well okay some still are,and can solve problems even though I am no longer a member.

McDoo SPF 931