Can you give us a little more detail on your situation. Your LT is a 2000 model and could have one of several different intercom systems on it. The plug that you mention...is it under the bike computer to the right of the left mirror?( a 6 pin DIN Jack) If so, it is most likely from a BC-1, BC-2, or J&M Comm System. Those are short cables that can be replaced since they are BMW parts. I have replaced one without too much difficulty.
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747,891 miles on touring motorcycles since 1990
IBA 45658 MOA167437
2000 LTC 90,600 miles KIA (new)
2003 LTE 164,188 miles Silver (Purchased with 1687)
2008 R1200RT 176,196 miles (Purchased with 16458)
2017 R1200RT 96,669miles (new)
Total BMW miles 509,508
1982 GL1100 rode 84108 miles (bought with 12012 sold 96120)
1988 GL1500 rode 12067 miles (bought with 19893 totaled 31960)
1989 GL1500 rode 142208 miles (bought with 20302 sold 162510)
Goldwing miles 238,383