I bought a trackside usb with an sae connector. I cut the wires and crimped some male spade connectors. These will fit in the accessory wires in the headlight cluster. I choose the constant hot terminals because the usb adapter doesn't have any indicator lights to drain the battery, and any accessory that is plugged draws very little power. You could use the switched power source if you prefer that.
The usb is mounted with machine scews on the clutch side of the headlight plastic. I used the smallest drill bit that would allow the screws to make their own threads.
Using a 1 foot usb cable is the perfect length.
The usb has a waterproof plug. No issues with any clearance while turning.
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