Dead batteries

[Angler]

I have a 2017 302c , the shore power breaker blew at the marina causing the batteries to drain . I had all the battery switches off except the house battery, I have reset the breaker on the dock and now have house power but only the starboard engine will start . Are the battery disconnects supposed to prevent that from happening? I’m hoping the other batteries will charge over night and be able to start , any ideas?


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[knotflying]

I'm not sure why the one engine will start and not the other. I am also not as familiar with the electrical setup on the 302. If you had the engine batteries off then they should not have been affected by the loss of power. Are there two separate batteries for the engines? I'll assume if so both were on? Is there a parallel switch between them? If there is then if one starts on one battery then it should start in parallel.