I just got this 2017 521c and battery bank 3 for 36 volt trolling motor stays red one light only….other banks are green and all set. I did mistakenly at one point reverse a wire and had a spark after a min of charging..also removed battery to install in hull transducer and some how nuts not completely tight…any way…error on me. However I swapped out the battery with an older and still same issue..one solid red light…batteries are both above 12.2. Any thoughts?