Join Date: May 2016
Location: Gloucester, VA. & Manassas VA.
Looking at the back of your usb plug, you need to make your own wire harness by crimping on the spade connectors to some wire. I would use red for positive and black for the negitive. You will run and secure the new wire to the wiring already in place over to the accessory plugs on your bike. The owners manual or service manual will tell you where they are located. Then you will have to crimp on the proper connectors for the plugs. Most of the time it will be a bullet connector. Not sure on a Gen 3 bike. Search for how to crimp insulated connectors and wire size for the load that will be needed with your usb plug. (Info can be found in the series regulator how to posts )
You said that the relay is installed so your accessory connections will be switched to the key and have a fuse to protect the wiring. If you use the accessory plugs you won't have to cut/ splice into any wire.
If you haven't done wiring crimp connections before, buy some extras and practice at the work bench not on the bike.
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