Mystery electronic box - help!

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Sep 25, 2013
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Hunter 340 Toronto
I am trying to sort out my electrics on my '99 Hunter 340. The previous owner has done some questionable wiring changes with the switch alt etc. Such as everything is on #1 on the battery switch.

My question is what is this box? There is no identification on the box. Filter? Combiner? Both bottom wires go to the switch - common and 1, and the small wire on top goes to negative bus.

Anyone recognize this or educated guesses?
Thanks!
 
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