I have an older trolling motor that was given to me. It is a hand control minn kota Turbo 65 36 lb thrust 5 speed model. I opened up the top head and tried folling the power. From the battery, the wires go into a small(2"by 2") black plastic cylinder thing and then several wires come out of it and they run down the shaft. Well I have power running into that little thing but none coming out. Not really sure what it is, transducer? motor? My question is, what is this little black box and would I be able to buy a replacement part or do I have to trash it?Also would like to know if I can somehow bypass it to just double check that the TM will actually work before I replace it. Can I run power directly from a battery using a jumper cable and directly touch one or two of the wires running down the shaft to see if it will spin the blade or is this a bad idea? Thanks for any help.