Thanks all!
.As AP mentioned above, you don’t really need those two “short stop” breakers on the two jumper wires between the three troller batteries. BCB installs them at the factory as standard equipment. I would also replace the main breaker on the positive troller lead with a Blue Seas breaker/shut off rated at 60 amps for your Ultrex if it is still the 50 amp breaker from the factory.
It’s a known peculiarity of the Ultrex that if you run it on 10 for some time, it will trip the breaker, even with a 60 amp device which it calls for. On 10, current draw is mid 50 amps. It has been mentioned many times over the years on the electrical forum over on Bass Boat Central. Apparently, somewhere in the manual MK mentions not to do so. You already have discovered that running it on 9 avoids that issue.
