Adding a second battery.

Tablerocker

Member
I've decided to add a second battery to my boat; there've just been too many times when I almost ran the battery out of juice whilst coving out and jamming to some tunes.
In the case of my boat, I am going to have to put the second battery on the port side, or opposite side, of the boat, which will mean some fairly long cable runs. I'm using good 4/0 cable, so I feel I'll be fine. I've already got the selector switch mounted and the cabling for the first battery done.
One thing I am considering is to run the negative cable of the second battery to the engine block, rather than back to the other battery. I am slightly worried about a ground loop if I do this, though.

Thoughts?
 

nathan

Active Member
normally the ground on the original battery is connected to the block so connecting the other to the block should not be an issue. just make sure that the original battery is grounded to the block. if it is then it is just like connecting it to the battery
 
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