when i switch 1-2-Both switch to bank 1 all is good. When i switch to bank 2 the 12v lights flicker and buzz. Voltage is showing good for both banks. I have checked all connections at batteries, grounds, and at switch and can't find any problems. also, Link 2000 is showing error "lobatt" for both banks? should I be looking at the switch itself as possibly bad? could the Link 2000 be causing the problem?