On my 09 - its on the right side in front of the side cover. As Schmidtys said it's tied to a wire harness. When you check your oil you will almost touch the connector. It will be a universal connector so just about any charger/tender will plug in.
2009 FLHTCU Ultra Classic Electra Glide - Vivid Black
Stage I w/SE A/C & SEST
V&H Dresser Duals w/4" Rineharts
HD Oil Cooler w/Low Temp Thermostat
Flo Oil Filter/Cooler
"Whether you think you can or whether you think you can't, either way you're right!" - HF