Wired the pitot heater pigtails into a molex connector. The Garmin has 2 pos and 2 neg wires because you can wire in parallel for 14v or series for 28v. I've gone with a convention for molex connectors where whenever possible, positive will be pin 1. in this case, I'm not doing a local ground for the pitot so pin 2 is neg back to the cabin.