I just scrolled thru the elecrical breakdowns for my 8050,
thought I might see the short wiring harness that would connect to your 10 pin and go back to
the trailer connector, no luck on that, did find the trailer connector, (European style)
TZB9440000A3 TRAILERSOCKET,
Correction I went back and saw that I had a PDF breakdown for a 4720 and scrolling thru I found an
electrical page which had a part number for item #44;
TZB9440000A3 TRAILER SOCKET ***'Y, looking at the picture that appears to be the complete
assembly to plug into your 10 pin connector it does also include the Euro trailer connector
Lou