Bikemaster 12V/15A Standard Cigarette Lighter Socket for Power Supply
This is a hard to find item, especially configured for motorcycles and water resistant.
Power in cables have rubber grommets and the power out has a tight fitting rubber cap.
Mounts either through a hole drilled in body work or a bracket (not supplied).
Because it has a ground wire, it does not need to be mounted to anything if you do not want it to be.
Perfect for the bikes that do not come with factory power outlets.