I'm adding a handlebar switch for aux lights and part of the process is to connect to a switched wire on the bike. This means a wire that is off when the ignition is off.

Does anyone have a suggestion of a wire OTHER than a head/tail light wire that would work?

 

Fuel pump. Just a W.A.G. But it's about the only thing I can think of.

 

You don't want to overload any one particular circuit. This might help. Look at post #9.
https://www.hdforums.com/forum/dyna-...ry-lights.html