I went to hookup my battery tender and found that I left the pigtail on my '82 yamaha back when I sold it. The tender also has aligator clips, so I'm using them. But I noticed that there is a stock connection coming off of the battery. Couldn't find anything about it in the owners manual. It looks like you could hook a battery tender into it but I wasn't sure. It also looks like it is fused, so maybe it's for an accessory?