I've 4 batteries in my engine compartment...I'm assuming one for each engine, one for the genset, and one for the 12 volt systems (vacuflush, stereo, refrigerator, etc.) On several occasions over the past 8 years, while away from shore power, one of the engines starts and the the other, not so much. Upon using the emergency start button on the dashboard, the breaker switches on the main panel in cabin shut off along with both engines. Is there a wiring diagram I can reference to see if the wiring is faulty? Thank you.