I am having an issue with my starter battery going dead after 24 hrs. I believe the fridge is directly tied to it. The starter battery is supposed to be dedicated and separate from the house batteries.

When I have the boat out and not plugged in for about 24hrs, the batteries are on "1" (house) and the only thing on is the fridge, the starter battery goes dead. The starter battery is a year old, and is sealed so it doesn't need water added.

Anyone know how I can check to see if this is really the issue and if it is, how to tie it back to the house bank as opposed to the starter?

Any advice is appreciated!
Nancy