I had some doubts about running a circuit separate from the ignition because of the potential of inadvertently running the battery down, but I found last night when I was sitting along the side of the road in the pitch black it was nice to have a source of light with less draw on the battery than sitting there with the ignition and all lights on.
I suppose the headlights aren't the only thing run off the "ignition" circuit that's hot only when the key is on, but I didn't want to be limited to that. I wanted a simple circuit wired directly to the battery and not depending on anything else. Had it been a headlight failure last night, I could have easily switched on my backup and continued home, although at a slower pace and probably not "legally."
I figure the only way my battery would be discharged would be if I forgot to turn the backup light off (not very likely, because I only turn it on from time to time to test it) or if somebody walked by the bike and even noticed the switch and then had the inclination to turn it on and I find that scenario very unlikely.
All in all, I'm happy with the totally-separate circuit for my auxiliary light. Just something for you to think about when it comes to powering the lights.
Last edited by planalp; 09-23-2011 at 10:51 AM.