wrote in message
oups.com...
The radio memory only draws a tiny amount, some people hook up an
ordinary 9 volt alkaline battery to keep all the memory things alive
when the system is "off" The 9 volts is enough & one battery should
last
you the season.

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Question: If the 9-volt battery should "last a season" wouldn't there
be almost no chance that the radio memory was drawing down the primary
12-volt battery in a week?


There are 2 power wires to modern radios. One to keep the station presets
and to to keep the anti=theft circuit alive. Then there is a power to the
radio and amplifier. And most wakeboarding boats I see have large amps, for
the big speakers on the tower. So just run the preset wire to the battery
and and turn off the power switch to all else. For a 2nd battery, use
either a battery combiner or battery isolator.