Proper way to unhook dual batteries to charge

Jbender5

Member
Joined
Jul 16, 2007
RO Number
27478
Messages
62
This is my first winter with the boat. I was wondering if there is a particular order I should unhook my batteries, so I do not cause a short or shock myself. I plan on taking out the batteries from the boat, checking the fluid levels on them, then trickle charging each battery. Since I have never done this I could use any help I can get. If the fluid levels were low I was just planning on filling up the batteries with distilled water. Is this correct? Any pointers would be appreciated.
 
Once you turn the battery switches to off, you have isolated the batteries from the boat.
At that point, I would do the positves first, then the grounds, but I don't think it matters.
Just make sure nothing touches anything.

I saw someone once use a real long socket wrench and he actually touched the positve and negative terminals to each other with the wrench. Nice spark!

You may get sparks so be careful there are no fumes or gas in bilge when u do this.
 
also, make sure your onboard charger is turned off (or shore power is off).
distilled water indeed...
 
Pascal,
I think once the battery switch is turned off, the batteries are totally isolated, even from the chargers.
 
“Pascal,
I think once the battery switch is turned off, the batteries are totally isolated, even from the chargers.” Above is an incorrect assumption! Many chargers are attached to the battery terminals on the battery switches just like bilge pumps and other “NON-SWITCHED” loads. This allows the charger to be on maintaining the battery strings while the “Switched loads” are off.
 
I know when you turn the battery switch off, you've isolated the battery but to me, I'd remove the Neg. one first, when reconnecting the battery, I'd connect the Pos. one first.
 
DeeVee, you got it.....always remove negative first & replace last !! That's the way I was taught.
Also agree with Michael Clemensen as that's how my charger is hooked up.
 
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