PERKO Inc. But adding on-off switches to the circuit you can force the alternator to charge the battery you want charged. If you have any questions or doubt about how to use, install or wire any battery switch, consult a certified marine electrician. Battery disconnect switches help manage the Related searches for marine two battery wiring diagram dual boat battery wiring diagrammarine dual battery switch diagram2 battery marine wiring diagram2 battery boat wiringmarine battery switch wiring diagramdual marine battery wiring diagrammarine battery charger wiring diagramtwo battery switch wiring diagram