[cp4000]

Hi guys,
Recently purchased an 88' 3300 open and love it so far.  Spent the last week getting to know it better and had a few questions I hope someone can answer.  There appears to be a small flashing LED light on the STBD side next to the arch.  There is a small door on the STBD side that I can look through and noticed the LED goes down to a double-D battery pack.  It does not seem to go to anything else?  Battery pack to LED, any ideas?  Another question, there doesn't seem to be a waste tank level indicator.  Do you just check that manually?
Thanks and I'm sure there will be more to come...Love everything I've seen so far!  What a nice boat...
JF

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Just remembered...
As we were driving it over from MI to WI, @90 miles, the STBD low fuel light came on with about 20 miles to go.  We arrived ok but were confused with the issue.  It is supposed to have one 295 gallon tank.  If one tank, why would it have a low fuel light for port and stbd?  Both valves were open so what would trigger the alarm?  Could it be a fuel filter issue or some kind of a sensor?
Thanks again!
JF