same problem as you tried scotch locks.. tried tap locks..
then did a test just put one wire in scotch lock and tested with multi-meter... the wire was held firm but no continuity.. Apparntly the coating is too hard and they are not going through well.
So bit the bullet and stripped the wire and soldiered as well..
A couple of other issues..
2010 lgt .. manual.. the shifter trim does not come all the way off which makes is more difficult (becuase of the reverse ring).. I double checked one of the subaru install .pdfs .. sure enough it says the shifter trim in a manual does not come all the way off.
2. i had the clear ring.. so the leds are a bit touchy to keep in position since they do not seat well with the ring in place. I used so tape and silicon and let it dry overnight. Only problem with soldiering I don't like is that you cannot use heat shrink tubing as I just stripped and did not cut the wire. Had to make due with electric tape which dries out and comes off over time.. Oh well.
I used purple and found the leds at pep boys.. They stock them in the stores. Also bought blue in case I did not like purple..
A couple of other hints.. when placing the leds.. try to get them to touch the lucite ring. Air is not as good a conducter of light.
second, for testing your circuit and soldiering of the two leds together a 9v battery works well.
I will post pict tonight when it is dark.
Now anyone know anywhere to tap on the right passenger footwell for the same thing.. The glove box led does not dim with the car, and I want to install the led door sills but the factory tap location in the Piller is insane as others have noted.
thanks for the writeup.