To make it easier to connect the battery tender to the battery of my 2008 Heritage Classic (The Army Bike) I added a new part to the bike.
Harley has a Battery Charging Extension (part 99821-09) this $14.95 (that’s right not HD (hundred dollar)) product that not only lets me more easily charge or maintain the battery but also flashes a red LED when the battery reaches a level that it requires charging.
To connect my battery tender, before buying this product, I have to remove both seats and attach the clamps to the battery. As often as not the clamps would slip off and the battery fails to maintain charge. This device attaches to the battery and snakes down to the swing arm. I zip tied the business end to the swing arm to keep it in place and looking neat.
Installation was straight forward and it is working as advertised! I am give it 5 stars as it does what suppose to at a non-HD price.
Battery charging extension installed on HD Softail
I JUST WANT 2 RIDE!! 
I’ve got one on my Ultra Limited as well, it’s great little bit of kit.