Most electronics equipment keep use some voltage even when they are off, maybe a volt or volt and a half. I just installed a new unit and used the existing switch. Altho I disconect the batteries after each trip. Something I learned years ago...if you have a fire on a boat or car the insurance won't pay for the part that failed, weather it's a switch or bare wire so I disconnect so if there is a fire it won't be anything I did wrong.


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