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I have a twin engine boat with three batteries. It only has one battery switch. Should I have two battery switches for this setup? My port engine battery doesn't seem to hold a charge. How can I test it? I also have a battery charger in the mix. This is a new boat for me.
 

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I also have three batteries, but have two switches. I have two of the batteries hooked to the milti switch and the third in parrellel with a single on/off switch. This allows me to charge all three batteries while in dock. I turn off the third batter whild under way and use it as a jumper for emergencies. I have yet to drain the two batteries, so I am not sure how this set-up should work, but my 3 EE classes say that it is a good bet...
 

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You should have 2 switches, one for each engine. The only way a single switch could control 3 batteries is if 2 of the batteries were tied together to create a single bank (ie. switch position 1, with the single battery being position 2)
 
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