Not necessarily for my f150, but I'm going to be installing a Hardwire Cord for my Escort Radar Detector. I'm planning on taping into the 12v outlet that turns off with the key. My question is, if the vehicle is turned off, should I still disconnect the battery before crimping the wire tap into the hot wire? I only ask because I'm at work and it's really slow, so I wanted to wire it up on my 10 min. Break..... rather then wait until I get home and do it in the heat....