I posted something on this last year I believe. Here is the issue. 4 battery system, one each for starting the twin outboards, and two for house battery. Both house batteries are on one switch, and separate switch for each starting battery. The switch bank also has an emergency parallel switch.
Not all the time, but more than half, I will turn off the switches, but they don't act like they are off. For instance on the starting batteries, they will be switched off, but if I turn the keys on the Yamaha outboards to on, it will light up the gauges. Now they will switch to completely off if I try to start them. Same for the house battery, it will have a residual "charge" in the system, but if I turn on a high use object, like the lift system for the kicker, it will "drain" it, and all systems are off.
Something in the system is keeping a charge after the switches are turned off, and it stays on until something drains that residual charge.
I'm clueless. Any ideas?