We have the same tow bar assembly along with the Invisibrake, which is what it looks like you have from the look of the small wire. We’ve had ours for almost three years and it’s (tow bar and brake system) still working well.
When hooked up, I wind wire around the the umbilical so it doesn’t drag. When unhooked, I wrap it around th the hitch ball then slide the connector end through the wrapped wire. When disconnecting make sure to grab the metal connector and not the wire or it will separate from the connector.
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