marine charge controller

Hi,   new here, and hope I am not offending the intentions of the group.  I have an Arco M65 panel on a sailboat , that runs ( or did) to a Sun Selector M8 charge controller.   The panel wires ran thru a water proof 2 pin connector which corroded or failed.  I cut the wires from the panel so I could remove it, and yes, I marked them so I could id pos and neg.  Unfortunately, don't laugh, I could not resist taking the  Boing ( ? ) connector apart to see why it failed  ( one the pin sheared off) , and then realized I had removed any way,  for me,  to identify which wire was pos/neg.  The installer had used 2 white wires from the connector.  Anyway, I think I sizzled the controller when I went to hook up the panel, so I think I need anew controller.  I get juice from the wires going to the battery, but the lights on the controller showing  analyzing, charging, etc, are not lighting.   I want to replace the controller, but simply connect the new one to the wires leading to and from the existing controller.   The existing controller has 2 orange and one brown coming out.  I think each orange goes to one battery in my 2 battery bank, wired in parallel.  There is another 2 batter bank, but that is, I believe, the starting bank.  I also have a selector switch with Off, 1, both, and 2 on it .  The Company making the old controller is out of business.   If you have stopped chuckling, and can recommend a charge controller please let me know.  The arco panel says 43 watts, max 3.68 amps, max volts 20,  5 amp fuse. Many thanks for any suggestions.  Dan McElwreath