Hi Maxrj,
There is no "other" end to this harness for the "Electric trailer brakes".
The blue wire is left out of the plug that connects to the wiring connector from the factory, if this wire is plugged into the plug it provides permanent power to pin 5 (which is normally the supply for the electric brakes) so is left out as mostly people want the brakes more than the power.
I gather u know this but in case u or someone else doesnt,
The Black +ve & White -ve wire go directly to the battery via a 30amp circuit breaker NOT fuse & The brake pick up (red) is connected to the brake switch under the steering column & the blue wire goes to the blue wire behind the tail light.


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