The outlet is very simple, just get your voltmeter or test light and check for voltage on the wires that supply the outlet.
The black wire you Tee'd into is just a ground wire.
Test with a test light between the colored wire and another ground, to see if that black wire is no longer making a good connection to ground.
The colored wire is on fuse #47 a 20 amp, behind dash, and that is after a 40 amp fuse #7 under the hood
I have no idea what a "PIE aux" is, or why you would have Tee'd into the ground wire on a 20 amp circuit for it.
The cigar lighter is the simplest circuit on a car. You have a fused hot lead, and a ground wire.