l.e.d. lights

i tried installing some led neons the other day. i tapped into the radio fuse. that should have been enough power, but apperantly it wasnt. plus i couldnt find a nice all metal grounding spot on the inside of the car. i ended up just runnign the wires right to the battry, but thats not clean enough for me. i want all the wores to be hidden. has anyone install these in a new stang yet?? if so where did you tap thepower and ground?

i tried touching every thing metal witht he ground and nothing. maybe the power source wasnt right. i mean i tapped into the radio fuse. that should have been plenty. right now its freezing. so ill wait till its warm and can spend more time.