I'm actually in the middle of this type of project right now. I have the parts on order but haven't started any of the work yet.
I'm using the method outlined in this video:
Here's the parts I ordered:
https://www.amazon.com/dp/B01A6LTK44?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://www.amazon.com/dp/B08RBWX2GL?psc=1&ref=ppx_yo2ov_dt_b_product_details
Less than $16, no splicing, and easy to undo with no changes to the bike if it's not working or starts causing problems.
Ok … good news … bad news … the good news is there is a 12v switched connector under the Faring and also under the seat … you should be able to access it by turning the bars to the left and hopefully not have to remove the front part of the faring (but if it’s really taped down, it might make it easier.) … Now for the Bad News… the connectors changed in 2019. That blue 2 pin Delphi connector was replaced by a smaller 2 pin connector. Check your connectors before ordering parts …
So if you have a’14-‘18 heavyweight Indian… you can get this Optimate adapter to go from The Delphi connector to SAE. Then use any SAE to USB adapter you like …
👇 ‘14-‘18 Connector (Blue)
👇 Adapter to SAE
👇This is the New ‘19 and up connector…
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With the ‘19 and newer connector, you will need to build your own adapter… I suggest to SAE, because of all the USB options it gives you. But you can build whatever you like…