[tye1138]

One of the black grounding wires goes from the battery to the motor, right behind the crank case breather. Another ground wire goes to the voltage regulator and fuse box.

If you've got 2 loose connections one is red (starter fuse) one is black (ground wire) that makes sense to me.

 

[tye1138]

The big thick one labeled #1 should go to the regulator connector, thats good. The one labeled #3, that one looks like the starter motor terminal to me. Ducati usually puts a bit of red around the neck of that and as you can see, its silver from it having gone missing. Follow the cable with your finger and find out where it goes. The #2 labeled cable goes to the battery tender connector, its not a factory part.

 

[tye1138]

IDK what the confusion is...

#1 and #2 screw onto the metal plate thats dead center in your image. That plate joins them with the motor ground, which is probably whats already attached to that plate. That plate t hen screws onto the battery ground terminal. You don't have to use it, its just more convenient. #3 goes to the positive side and it looks like your missing another positive connection, I don't see the metal plate for the positive side hanging around anywhere.

 

[tye1138]

We need to see a pix with ALL the cables... I really can't tell with such limited information.