Wiring the second battery?

[Andrew_as 10+ year member]

Oh lol

 

[MmatsDude 10+ year member]

does anyone have any diagrams to this?

 

[crunch5868 10+ year member]

ok i am doing my first setup and i also have this same question so let me see if i got all this right. I have 2 batterys (front and back) and one amp. I should wire from the + front battery to + back battery, ground the - on both batterys and then run from the back battery + through a distro. block to the amp, with 2 fuses between the batterys?

 

[king ranch 5,000+ posts]

i was wondering one thing bout a second battery do you run the pos from the alt or the pos terminal from the battery and does it help to run a ground from the front battery as well

 

[crunch5868 10+ year member]

^^^?? anyone

 

[Alpineforever 10+ year member]

Run from + of one battery to + of another with 1 fuse at either end of the wire

Run from - of one battery to - of another, I didn't fuse that wire, I probably should, don't know if it's necessary, because if one fuse blows the whole circuit should be disconnected... I think...

You can run the amp from the + of the nearest battery just like normal, and ground the amp to the - of the battery

 

[Robahr24 10+ year member]

Since the first battery is already grounded, just connecting a wire from the second - to the first batteries - will just ground it anways right?

 

[allout13 10+ year member]

my diagram of how mine is wired...

the only thing missing in the picture is a second fuse between the 2 batts

 

[Robahr24 10+ year member]

Why would you run 2 fuses between the batteries? One big one would be enough wouldn't it?

 

[allout13 10+ year member]

what Ive been told in a thread I started is...

Agree, x2.
This isn't your current problem, but I also think there should be another fuse near the second battery. Not everyone recommends this, but I do. If your power cable shorted out in the middle (like at the fire wall) the fuse near the main battery would pop and protect the wire inbetween the main battery and the fault to ground, but there would be nothing to protect the wire from the second battery to the fault to ground. That section of wire would get red hot, melt it's insulation and ground out the battery till it explodes and/or sets your car on fire.

I dont currently have that second fuse, but I think I am going to try and add one soon

 

[Robahr24 10+ year member]

what would be the point of that? I plan on running a 2000 Watt and 800Watt amps. What size fuse do I probably need for it (maybe 250amp). Will 0 guage wire suffice for all the battery connections and back to a distribution block. Than run 4 guage to the amps?

 

[knukonceptz 10+ year member]

I post it again:

http://www.knukonceptz.com/assets/te...alBatt.amp.pdf

More common is to run the wire from Batt A to Batt B then to your Dist block. With our blocks, they have dual 1/0 in so you can use both ports and save a few feet of wire. Thus the above diagram takes advantage of this.

Q - Why do you need two inline fuse holder with a dual battery?

A - the reason you use an inline fuse is to cut power to the wire in case of a short (car accident). You put this close to the battery so that it protects the stretch of wire going through the cabin. An area that has plastic/carpet (ie more flammable materials).

The battery is your power source. When the fuse blows, power no longer travels through the wire and the circuit is now "open". Adding a second power source at the opposite end of your power wire now engergizes BOTH sides of the connections at the fuse holder. The only "OPEN" part of the circuit is the blown fuse itself, rendering the fuse useless because power exisits at both sides of the holder with or with out a good fuse. By adding the second fuse holder at the rear battery, if the cable is now shorted, both fuses blow and the length of wire from Fuse A to Fuse B is no longer engergized.

 

[allout13 10+ year member]

what amps?

 

[knukonceptz 10+ year member]

For a dual battery install, you would go with the highest amperage your cable is rated for

 

[TurdFergueson2 5,000+ posts]

ok i am doing my first setup and i also have this same question so let me see if i got all this right. I have 2 batterys (front and back) and one amp. I should wire from the + front battery to + back battery, ground the - on both batterys and then run from the back battery + through a distro. block to the amp, with 2 fuses between the batterys?

In your thread from yesterday, I gave you the exact way to do this. Do you not trust me?