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. Editors note ed sherman is a leading authority on marine 12 volt systems and marine technical matters and is a regular boatscom contributor you can learn much more about dc systems from his two essential books on the subject the 12 volt bible for boats 2 nd edition and the powerboaters guide to electrical systems. 14 steps to wiring your boat i need a simple wiring diagram for a small outboard boat to wire up the lights and few other things but no one seems to have one is there one and where can i find it is there a set of step by step instructions remember any 12v dc device has to have at least a positive and negative wire connected . Example of a draft wiring diagram for a simple boat when you make your own wiring diagram use very large sheets of paper for clarity most boats will have positive and negative busses where area wires come together equipment coming off a switchboard or circuit panel should be straightforward to trace
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