Mk1 Tow Bar Salloon Wiring

[mark .v363]

hi can anyone help i need to know what colour the black wire off a 7 pin tow bar electrics goes to on a 99 focus 1.8 ghia goes too i got the others as someone cut the electrics off the old tow bar when they removed it so rest all done as they left the scotch locks in place with the wiring colours. all help will be verry appreciated