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One yellow, one red?

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I want to run two batteries on my rig. I thought it might be a good idea to run one deep cycle along with my starting battery. Do I need to run an isolater to do this or can I just hook them up in parallel and call it good?
 
Paralleling different battery types can lead to over/under-charging problems.

I would use a marine battery switch, or continuous-duty solenoids.

Isolator would work too, but doesn't give you the choices.

I'm not making a recommandation, but a sampling of what's available
http://www.12voltguy.com/catalog.0.html9.0.html
 
Battery Mates and ACR's are the best tech for dual battery charging... Superior to any isolator system..

But I agree with the others, if your gonna run a starting and deep, you should have them be selectable in one way or another...
 

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