Re: 2 questions for new boat owner
A radio that has a clock in it will kill your battery and some depth finders never completly shut down.
Turn off everything in the boat,disconnect the battery,hook a test light between the neg.terminal and the end of the cable.If the light comes on then something is draining your battery.
If it does then start removing fuses one by one.
Get the battery tested.You have a volt meter in the dash? no,get a multimeter and check voltage at the positive terminal.Check when off then check when running.
Then the regulator is probably bad.Get a manual and start running tests.
Fill out the profile,someone might live close that can help.
If you fix it post your results.J