Rocket 3 GT power port to a Battery charger/tender?

Mine has one installed from the dealership. My Bonneville had two installed, one for each side of the bike.
 
Not that one. But you can install the Auxilary Power Socket on the left side of the bike (part number A9820089) - primarily intended for heated clothing and good for 20 amps, and charge through that. Triumph will sell you the appropriate charger lead (part number A9930600) and a matching Triumph version of an Optimate charger (part number A9938825).
 
I bought this one to connect to my battery tender:

Cllena DIN Hella Powerlet Plug to SAE Adapter Connector for BMW Motorcycle https://www.amazon.com/dp/B07RPTZNP...abc_FFPP4KVSVW72RY5K9PK3?_encoding=UTF8&psc=1
 
Also, believe the front DIN port, the accessory auxiliary power socket, and the USB port under the seat are all on the same 20amp fuse from what I could tell.
 

There is a slight typo on the official diagram, the top 'Front Accessory Socket Live' is actually the optional socket under the airbox.
 
I just use on of these battery chargers, hope it’s the right one
 

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If your plug is running of a relay , disconnect and run that wire directly to the battery if it doesn't lead to something else . Just a thought after warranty is over of course . And you don't let the dealer know !!! Opps I hadn't seen Mr.Pix's diagram . Can't seem to erase this . Sorry !!