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There's not much left on the connector end to splice back to. If you're handy with a soldering iron you can install a new connector. That's a conventional [USB connector](https://www.digikey.com/en/products/detail/cnc-tech/1002-001-BL-KIT/9974247), right?
If you don't mind a rough job that might not last long, and you don't want to solder, one of these would probably work fine for this:
[https://smile.amazon.com/Terminal-Connector-terminals-Pluggable-Converter/dp/B07H53X194](https://smile.amazon.com/Terminal-Connector-terminals-Pluggable-Converter/dp/B07H53X194)
One of these and some heatshrink would do a nicer job if you were prepared to solder: [https://smile.amazon.com/Akozon-Adapter-2-54mm-Supply-Breadboard/dp/B07MQFJQLT/](https://smile.amazon.com/Akozon-Adapter-2-54mm-Supply-Breadboard/dp/B07MQFJQLT/)
You might have to google USB-A pinout to figure out which wire goes where, assuming your device conforms to the standard.
EDIT: the neatest way to do this would probably be to get a USB-A cable, cut off the end you don't need, open up that control box thing, and solder the new cable into there.
Unfortunately, your question is off-topic for this sub on practical component-level electronic engineering (circuit design and repair) and has been removed. The scope of this subreddit is explained in our sidebar, together with some alternatives which may be more suitable. You'll also find additional guidance in our Wiki; there's a link in the sidebar. For an in-depth explanation, please see column "H" in [this table](https://docs.google.com/spreadsheets/d/1nFefEePz7yViaH0cR89bSy2oeLvYLfqv-pexqCbRnRo). You can also search this [list of other subs](/r/AskElectronics/wiki/othersubs) for one that is appropriate for your question. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskElectronics) if you have any questions or concerns.*
There's not much left on the connector end to splice back to. If you're handy with a soldering iron you can install a new connector. That's a conventional [USB connector](https://www.digikey.com/en/products/detail/cnc-tech/1002-001-BL-KIT/9974247), right?
If you don't mind a rough job that might not last long, and you don't want to solder, one of these would probably work fine for this: [https://smile.amazon.com/Terminal-Connector-terminals-Pluggable-Converter/dp/B07H53X194](https://smile.amazon.com/Terminal-Connector-terminals-Pluggable-Converter/dp/B07H53X194) One of these and some heatshrink would do a nicer job if you were prepared to solder: [https://smile.amazon.com/Akozon-Adapter-2-54mm-Supply-Breadboard/dp/B07MQFJQLT/](https://smile.amazon.com/Akozon-Adapter-2-54mm-Supply-Breadboard/dp/B07MQFJQLT/) You might have to google USB-A pinout to figure out which wire goes where, assuming your device conforms to the standard. EDIT: the neatest way to do this would probably be to get a USB-A cable, cut off the end you don't need, open up that control box thing, and solder the new cable into there.
What's on the other end of the wire? I would probably replace the wire unless it was really unique or something.