(JK if you think this is really an electronics q. rather than engines please feel free to move this).
My Yamaha control box has 3 wires (black/yellow/green) which come the box, in addition to the main wiring loom. I have never hooked these up to anything (principally because I originally worked on hand start, then when I added a battery it didn't seem to need these - OK its because I'm lazy
As I understand it they provide power simply to test the alarm circuits before starting the engine. My limitted knowledge suggests they really just test the buzzer is working and don't provide any useful knowledge on the temp/oil level.
Should I get up off my lazy ass and wire them in - or are these really just redundant?