you have to chop metal to get any turn signal LED to work. You can't just swap wires. Look at the socket plate that the two bulbs plug into, you can see that the metal that touches the shell of the brake / park light does not touch the shell of the turn signal light, but touches the center pole instead. The brake / park are perfect for LED, the turn is what screws it up.
The load resistors or the electronic flasher are just for the flash rate after you get all the LED working. Mine do flash double rate now. I'm gonna try to find a flasher that will work before I go the load resistor route. Less amps to burn = happier alternator.
Oh BTW don't just go get a flasher that will fit - you will blow a fuse. 15A easily replaced. Didn't learn that one in the manual

FYI anyone know offhand what flasher does work?