Duel Batteries

[Blacklab]

Hey all, I'm want to run 2 batts on my 2009 1500 silverado. I have a 95 amp alternator and the isolators I've seen are for 90 amps. Will this work, or do I need a bigger isolator. Thanks

[timberghost72]

Why are you adding a second battery and why do you want to isolate it. Answers to this will determine the best set up for you.

Depending on why you are adding a second battery you may not want or need to isolate it. Just run in parallel to the other battery. No need to spend a bunch on an isolater and switch set up if you don't need to.

[Blacklab]

 For the added accessories. Just wondering if I can hook up to a 95 amp alt w/ a 90amp isolator or do I need a bigger isolator.

[coachcw]

It will work fine . If your ussing it for a camper you may just want to use a continous duty solinoid though . if you just want more cranking power I'd just run # 4 or bigger cable from positive to positve on the Batteries.

[Blacklab]

Thanks coach 

[huntnphool]

It will work fine . If your ussing it for a camper you may just want to use a continous duty solinoid though . if you just want more cranking power I'd just run # 4 or bigger cable from positive to positve on the Batteries.

You might consider a larger alternator as well. You will find most dual battery setups are running alternators of 130 amp or larger.

[Special T]

IMO you don't need 2 batteries with that alt.... I ran a normal alt in my S10 with 2 ultimas for my winching... Had one go bad and killed them both..... Since you seem to think you need 2 it is smart to use an isolator, I would use one of the marine style that can isolate either or use both.
http://www.westmarine.com/webapp/wcs/stores/servlet/ProductDisplay?productId=17356&catalogId=10001&langId=-1&storeId=11151&storeNum=50523&subdeptNum=50543&classNum=50547#.USmUFmf3iMg

[timberghost72]

You do not need an isolator for running added accys. The point of an isolator is to power things up while your truck/boat is not running. That way you dont kill your main battery and end up stuck needing a jump. If you just add a few accys just put a bigger alternator on or add a second battery.  There is no reason for you to put an isolator on. Even if you are adding a winch a dual battery set up works just fine without an isolator. Most people don't winch enough to kill 2 batteries. If you are just adding some lights and other small accys don't bother with 2 batteries. Just buy a good quality battery. Sounds like thats what you are doing?