Dual battery setup for my car. HELP on how to do it!!!?

W

wishmaster

New member
Adding a second battery is not going to help your problem.
And it will actually be worse for your alternator because it will have to charge two batteries instead of one,plus keep the car running..
So i suggest you go ahead and buy that HO alternator.
 
Ok, so I am putting in a killer sound systems (2000 watts rms) and I've decided the cheapest way to power it is by another battery (vs a $500 HO alternator!). How do I set it up? Do I need a relay and a battery and that's it? HELP!
 
A capacitor is useless, it doesn't work the way the salespeople pitch it, doesn't help with dimming lights at all.

If you get a second battery, you have to replace your first one also, otherwise the first battery will drain the second one, due to the differences in age and charge. You have to buy two batteries at a time, when replace both.

If you get two batteries, you'll need a HO alternator, due to the added strain of charging two batteries, your stock alternator will crap out, because it will be running at higher RPMs to try and charge both batteries.

This is for installing a battery at the back.
To hook up two batteries, you'll need two runs of 0-gauge wires 17'-20',
connect both (+) to (+) and (-) to (-), for safety reasons, i suggest you add a fuse on the positive wires(300amp fuse), on both ends, if a short happens then the fuses will save you from a fire.
You can ground both batteries, or just the front one.
With this setup your alternator will be able to charge both batteries, and your voltage will still be at 12 volts.

Once you have that done, you can just hook up your amps directly to the rear battery.
 
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