what is this switch located on right side of bike underneath seat , behind, above engine oil fill

 

Looked up shows possible switch for add on extras like info center or cruise control. That's all I see coming up on search might ask dealer or pickup service manual. Good luck. Wild Bill.

 

When you don't know what it is then mess with it. I cycled the toggle switch and discovered that it operates a string of white LEDs under the Gas Tank and frame. It really sets off all of the chrome. I purchased a 2015 Ultra Limited with 385 miles on it. Its loaded with all kind of performance stuff as well as undiscovered goodies. New to Harley so be kind. I'm learning.

 

Barney, hi from the UK and welcome to HDF. Looks as if you will have fun finding out what else there is, waiting to be discovered! If you bought your bike from the same dealer who sold your bike when it was new, they may be able to tell you what add-ons are on it.