As far as your bilge pump automatic activation goes, your automatic switch MUST be wired directly to 12v BEFORE the battery switch. You can wire directly to the battery, or you can wire it to the input side of the battery switch. The idea is to have 12v going to your automatic bilge switch even when both the batteries are turned off.
Far too may boats have sunk because the automatic bilge switch was wired to 12v AFTER the battery switch, resulting in completely disabling the automatic bilge pump function every time the batteries were turned off.
Similarly, I have TWO automatic bilge pumps in my bilge.
One is the original 1971 Rule Master 1750 gph with a new Rule Super Switch mounted at the bottom of the bilge below the motor and connected directly to battery #1.
The other is a Johnson 1100 gph automatic pump with magnetic switch mounted 5" up on the center stringer, and connected directly to battery #2.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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