Just a thought but if you had your boat supplied by Peter's Opal (as I did) the wiring loom for the windlass was fitted in preparation for an installation prior to the sale of the boat and tucked into a corner of the bow
Now you mention it, I don’t know if the original/previous owner of my boat specified for a windlass to be fitted. However, the wiring colour of grey for the outer plastic coating on the cable that carries the directional signals and the use of ordinary copper wire rather than tinned plus some other wiring I’ve found onboard but which is not actually connected to anything suggests to me that Bavaria probably fit a standard wiring loom into all boats, possibly also including the heavy 170amp cables. This would be in readiness for any customer who wants to specify the addition of any of the standard electrical/electronic add-ons that are available.
So ChrisJr, better to check and see what if anything is already in place before you spend out on expensive 170amp cabling !!
If your boat is prepared in the same way as my B36(2002), then you will have space on a board behind the main switch panel for the solenoid control, you will have a multicore cable with at least three small wires for the directional signal from the windlass hand control forward through to the small wire connections on the solenoid plus three 170amp (or thereabouts) cables of which one will be for the negative connection and two for the positive wires (one for up and the other for down). The directional signal wires are all positive wires with one carrying the positive current to the windlass directional control from the solenoid, and the other two carrying it back (either up or down) to tell the solenoid which wire has to carry the 170amp load to the windlass, either the up wire or the down.