Turn signals not working, blowing fuse
Radio
CE2 (B) to Reverse lamp switch
Flasher unit - turn switch
Since its a single line, pretty much, what I'm suggesting is
a) confirm its short to ground.
b) then narrow down location by disconnecting at the far end and working back toward the fuse.
This is assuming its doesn't become obvious just by looking..
Heater
Radio
CE2 (B) to Reverse lamp switch
Flasher unit - turn switch
Since its a single line, pretty much, what I'm suggesting is
a) confirm its short to ground.
b) then narrow down location by disconnecting at the far end and working back toward the fuse.
This is assuming its doesn't become obvious just by looking..