The Fitech handheld is what I think you are trying to hook the laptop to download data? The handheld just needs to plug into the usb with a cable. No 12v supply is needed. It picks power from the usb. If we are still not on the same page I apologize
1 That is what I started..........only the handheld, only USB to my W7 laptop. Won't connect get "timeout" error
2...Found a post someone had posted the software, downloaded that and installed. Installed the "K-line" adapter driver after finding the note on the Yellow Bullet telling where to find