Adding 3rd battery

[Double Tap]

I currently have a two battery(starting batteries) system on my boat with a Perko off-1-both-2 switch. My boat has two 4 stroke 250 outboards(if that makes a difference). I want to add a third battery(deep cycle) for running stereo, vhf, fridge, etc when anchored and I want to wire my riggers to it as well. Is this a complicated setup for a marine mechanic or a DIY project? Any thoughts would be appreciated.

Andy

[Trouthunter]

no I am a mmi student will look at my notes to see how to hook them up

[lost a lure]

https://www.bluesea.com/systems

 

Check this out

[Double Tap]

I just realized in my post I wrote I had one battery switch, I actually have TWO switches as described above. The Blue Sea isolator set up looks interesting.

[Thun]

Could you add another fuse panel? I ran 6 gauge wire to a separate fuse panel (Blue Seas Safety Hub) with a 120 amp fuse at the positive terminal to protect the wire. Then I added this ST Blade Kit to the battery for the riggers, everything thing else is fused at the new fuse panel. I probably need a battery switch too.

 

https://www.bluesea.com/products/5024/ST_Blade_Battery_Terminal_Mount_Fuse_Block_Kit

[Captain Carl Bish]

Use those Blue Sea guidelines....sounds like you could use a couple of ACR's the short easy way would be to tie the ACR and house (3 rd) battery to one of your starters.  The best way is to tie it to both which will require 2 relays.