3 prong to Marinco style trolling motor plug wiring?

[92python]

I am switching out the plug on my bow mount that goes bad all of the time. I am going to a Marinco style from a 3 prong.

On the 3 prong female I have 3 wires going to the plug. from the front panel. Red / Black / Orange.

On the Marinco female I have 4 options for the wires:

A+

A-

B+

B-

I may be wrong but I was thinking Red to A+ Black to A-. Anyone know where the orange goes?

On the inside of the male Marinco there are 3 options (12, - and 24) for the 2 wires (black and red) coming from the trolling motor. Where on the male plug would attach the black and red wires?

Thanks in advance.

[92python]

One more detail:

I have 4 pair of wires running to the battery compartment. 2 from the bow, 2 from the stern back to switch panels. I am only using 2 sets of wires, one to the back recepticle, one to the front. I run a jumper between battery A black and batttery B red and run red wires from each of the receptacles to battery A red and black to battery B.

I have swithes bow and stern near the recepticles that have 3 positions:

Charge 2-12V

12V

Run 12/24V

Since I only use the 2 pair of wires switch position doesn't seem to effect my trolling motor performance.