I have Structure Scan units on the trolling motor and the on the stern, I wired the yellow wire from the stern LSS to the HDS 10 at the console and the yellow wire from the trolling motor mounted LSS to the bow HDS 7. When I turn the HDS units on it turns on the Structure Scan boxes. You can also add a switch in and power them that way instead. I run them both all day, along with the livewell and have had no battery issues so far. Mike