Spotlights
I just wired Wunderlich spotlights onto mine and my wife's F800s. I also didn't want to chop any of the original wiring. Mine came with three wires - Negative to Battery, Positive to Battery (to power the lights) and Positive to be spliced into the headlight power, to activate the solenoid when then headlights are on, and ensure that the spots go out when the ignition is off.
I simply led the solenoid positive to the battery as well, the spots are now always active so you have to remember to turn them off, but the lights could be removed easily from the bikes without any trace of them having been fitted.
Hope that helps?