For those of you that sometimes forget to plug in the 0-30 when you put the battery in or for get to unplug it when you take the battery out, this mod is for you. What I did is buy a small lever switch from Radio Shack. I simply spliced the red wire in to the switch. I then mounted it with some servo tape so that when I drop the lever to make contact with the battery, it turns on the fan. It has worked out great so far.