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12v power to boat with battery selector switch

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Milkman00

Member
I am getting ready to wire a battery selector switch on my boat. I have a question about the 12v system (radio, pump, lights, etc.).

I was going to run a lead from the output of the selector switch to my fuse box. What happens if I select my selector switch to BOTH??? How will that affect my 12v system???
 
Milkman00 said:
I am getting ready to wire a battery selector switch on my boat. I have a question about the 12v system (radio, pump, lights, etc.).

I was going to run a lead from the output of the selector switch to my fuse box. What happens if I select my selector switch to BOTH??? How will that affect my 12v system???
Click to expand...

Ayuh,.... It's a parallel system, it's still, 'n always just 12 volts,...
 
The "output" of an MBSS (main battery selector switch) is the "common" terminal.
The #1 and #2 terminals are "source" connections.

Use the #1 and #2 as though they are direct battery connections....... I.E., charger connections, bilge pump float switch power, etc.


Most use a dedicated starting battery on #1 and multiple Deep Cycle batteries on #2.
Avoid using ALL/BOTH!
Keep the #1 in reserve when on the hook!
 
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