Its pretty standard in boat wiring to bypass the main battery switch for one thing the boats bilge pump float switch this way even if your battery switch is off if your boat starts filling with water the pump will still kick on id rather have a dead battery than a swamped boat. Re installing 4 batteries need wiring diagram to start with you can think or your 4 batteries as 2 pair of batteries each pair is really a single battery in 2 parts so think of your 4 batteries as 2 big batteries add the pair at the helm as a separate battery and now you have 3 big batteries. Battery layout for twin engine boats posted by peter kennedy on 10 16 2014 to batteries conventional there are many ways to do a layout for multi engine boats here is one simple way to do it using remote switches. Two battery boat setup with wiring diagram blue sea two battery switch acr dual charging system this dual battery setup for boats uses the blue sea add a battery kit for charging marine batteries
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