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How to install a car CD player on a boat? - how to install a cd player on a boat

It is my 10th Birthday gift, I decided to put on a CD instead of a tape drive in the boat with my husband. Everything is connected correctly, but I have no power over the reader. Is there a way to know how many volts for my boat, how much for the needs of the music, and if my boat needs more volts, how can I solve this problem?