After further checking I think I found the problem and thought I would share. On battery terminal that 50 amp breaker was connected on top of one of the one board charger terminals before making its connectionto battery. This smaller in surface area spade terminal was not not able to handle the full amp draw between battery and breaker termianal which goes to trolling motor. Over time it actually was heating up and leaving carbon deposits which compounds problem by making a worse connection and increasing amp flow. ( see Ohm’s law). It had heated up bad enough to start melting rubber boot the covers terminal. I cleaned up all the terminals put breaker connector first on battery then on board terminal on top ,and dabbed on connections with silicone grease. I think breaker tripping might of just saved a fire. I am not for sure which breaker is supposed to be used ,but I am going to see how it works know as this is how it was rigged ,and would rather be on the side of caution than to put a larger breaker in .