Hello, I am a new owner of a 2020 HT 159" and am planning to add a small powered subwoofer under the passenger seat. My question is about the Upfitter rear speaker connection behind the passenger B pillar cover. I plan to tap into the audio signal on the connector and was wondering if I can also use the 12V power on the connector (pin 1 on the diagram below)? I already have the Tyco connector and pins. Also, is there a good ground location behind the b pillar cover where the upffitter connections are located or any other ideas where others ran the ground wire? Thanks.