im not familiar with the wiesel, however of my boats 4 have nav lights installed.

basically you need red (left) green (right) white (stern) white (masthead), any others are extra.

you may need to drill a few holes for the wires, and snap the mast off to get wires down it. I had to do this on my sydney star when I threaded lights down the mast.

a few pictures from you may help here