I am installing a USB port on my tw, and was looking for something that is only on when the bike is running. I was looking for what others have used. After a few searches, I see most use the tender port directly to their battery, however I am not responsible enough to be trusted with something I have to disconnect (I can barely remember to turn of my key.) So I’m thinking something wired with the ign sw, but I’m unsure where a good place to intercept that is. I see some have used the turn signal power, any one else have any luck with that?