CTEK Battery Maintainer Won't Work?
 

I won't be using my car for about a month, so I tried to hook up the CTEK battery maintainer that I use on other cars and my boat. It won't work! This is the first time I've tried to use it on the Mini. On all other vehicles, you just plug it into the accessory jack in the passenger compartment. I tried it with the key in, and that didn't work either. Any ideas?