Rivarossi Krauss-Mafffei Horn

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Hi all.
I have just bought a Rivarossi Krauss-Maffei Diesel Hydraulic loco which is fitted with a horn mechanism.
Some of the wires for the horn system wires are not connected so I was wondering if any forum members had one of these and could post a photo or description of how the system should be connected.
The photo below shows the inside of the loco and the horn and battery holder - the horn does work if a battery is placed between the wire near the battery holder and the horn body.
There may be some parts missing as there is no rear battery connector and no indication of where the wire from the operating switch goes to.
Can anyone help ?
Thanks in anticipation, Colin.

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