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What drained the battery???

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Ok last year we bought a 2008 LVS 20'. It has the dual battery hookup but we only have one. We don't use the wedge. Last year we left the battery switch under the seat compartment on without problem (removed the key each time so the power eventually goes off). This year I was turning the main switch under the seat off because I wasn't sure we would be able to ski everyday. Well one day I left it on because I was for sure skiing the next day. Battery was dead as dead could be. I looked thru all the pages on the electronic controls and nothing was left on. Any ideas on how to find out if this was a fluke or if something is draining this battery? I have been turning it off again at the switch under the seat because I am afraid of going out to another dead battery. But this is a pain as we have to put the tower down to put it on the lift and with the mirror the seat can't be raised unless someone else holds up the tower a little--two man job that used to not be required. Any suggestions, help would be appreciated. THANKS!

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One additional note, the only thing that I can think of that changed from last year to now, is that Malibu came out over the winter and replaced both the electronic controls on the drivers controls. Could this have caused something? Like I said, I did page thru and nothing was left on. The 8 times before that I used the boat, the battery had a strong start to it. The battery was kept inside over the winter.

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Here is how I check for draws. Disconnect the - battery cable and connect a 12v test light in line with the cable. If the light is good and bright you have an excessive draw. It is ok for there to be a slight glow. Then to find the draw start disconnecting electrical loads like the power wires to the stereo or the bilg pump. When the light goes out you found the draw.

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