360'wiring question

24&25

I did talk to a humming bird rep. The lady indicated that you use the black and red wire only. It was not an extra ground or anything. The connector plug has three terminals I it too. I documented it all in case smoke comes out. If I find out differently will let you know. Knappy.

On the top of page 25 of the 360 Imaging Trolling Motor install guide it tells you to:
6. Tape the drain wire.
This is the second black wire (actually is a bare wire with heat shrink on it). I think that Rickie is correct in that it is for RFI if needed.