they shouldn't have had to cut into anything... just splice a lead from the brake light and ground it and they were all set. sounds like they f'd up.
this is why I do research, and my own work.
with factory wing light wiring, there is a lead that is run up through the trunklid... on the 03.5 it terminates near the upper left hand corner (of looking at open trunk from back)... on the 03 MSP i believe it goes to the center... ES I would imagine is one of those 2, but I do not know which.Can anyone tell me or show a pic of where the brake wires plug into?